Axit Frohydric - HF - Frohydric Acid

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Công thức: HF
Hàm lượng: 55% min
Ngoại quan:Axit Frohydric – HF có dạng lỏng, màu trong suốt.
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. Tên gọi khác: Axit Frohydric, HF, Frohydric acid

Tổng quan Axit Frohydric – HF.

Đặc tính: Axit flohiđric là một dung dịch của hydrogen fluoride (HF) trong nước, Cùng với hydrogen fluoride, hydrofluoric acid là một nguồn flo quý giá, là chất tiền thân của nhiều dược phẩm, polymer (ví dụ Teflon), và phần lớn các chất tổng hợp có chứa flo. Người ta biết đến axit này nhiều nhất là khả năng hòa tan kính của nó do axit này tác dụng với SiO2, thành phần chính của kính. Quá trình hòa tan có thể miêu tả như sau:

SiO2(s) + 4HF(aq) → SiF4(g) + 2H2O(l)

SiO2(s) + 6HF(aq) → H2[SiF6](aq) + 2H2O(l)

Bởi tính chất phản ứng mạnh với kính, axit flohidric thường được lưu chứa trong các bình nhựa polyethylene hoặc Teflon. Nó cũng đặc trưng bởi khả năng hòa tan nhiều kim loại và oxit của các á kim.

. Ứng dụng:

Lọc dầu.

Trong một tiêu chuẩn nhà máy lọc dầu quá trình được gọi là ankyl hóa , isobutane Alkylated với trọng lượng phân tử thấp các alkene (chủ yếu là một hỗn hợp của propylen , butylen ) trong sự hiện diện của chất xúc tác acid mạnh có nguồn gốc từ acid HF. Chất xúc tác protonates các alkene (propylen, butylen) để sản xuất carbocations phản ứng , mà alkylate isobutane. Phản ứng này được thực hiện ở nhiệt độ nhẹ (0 và 30 ° C) trong một phản ứng hai giai đoạn.

fluoride trong môi trường, công nghệ thay thế đang được tìm kiếm. Florua vô cơ khác được chuẩn bị từ acid HF bao gồm sodium fluoride và hexafluoride uranium . 

Chất ăn mòn và làm sạch

Khả năng của acid HF để hòa tan các oxit kim loại là cơ sở của một số ứng dụng. Nó loại bỏ các tạp chất oxit từ thép không gỉ, một quá trình được gọi là tẩy, và các tấm wafersilicon trong ngành công nghiệp chất bán dẫn. Về vấn đề này cũng được gọi là BHF, (khi đệm với Fluoride Amoni), và BOE (cho Oxide đệm Etch). Nó là một thành phần quan trọng của Wright Etch và HNA tương tự (HF + Nitric + Acetic Acid) etch. Theo cách tương tự, nó cũng được sử dụng để etch kính . Gel axit 5% đến 9% HF cũng thường được sử dụng để etch tất cả các phục hồi nha khoa gốm để cải thiện liên kết.  Đối với lý do tương tự, pha loãng axít flohiđric là một thành phần của hộ gia đình tẩy vết gỉ và xe rửa"sạch bánh xe" các hợp chất. HF axit tấn công thủy tinh bằng cách phản ứng với silicon dioxide để tạo thành các florua silicon khí hoặc hòa tan trong nước. Quá trình này giải thể tiến hành như sau:

SiO 2 + 4 HF → SIF 4 (g) + 2 H 2 O

SiO 2 + 6 HF → H 2 SIF 6 + 2 H 2 O

Bởi vì khả năng hòa tan oxit sắt cũng như silica-chất gây ô nhiễm, axit HF được sử dụng trước khi vận hành nồi hơi sản xuất hơi nước áp suất cao.

Ứng dụng phá đá

Bởi vì khả năng của mình để hòa tan các oxit, axit HF là hữu ích cho việc giải thể các mẫu đá (thường là bột) trước khi phân tích. Theo cách tương tự, axit này được sử dụng trong macerations axit để trích xuất các hóa thạch hữu cơ từ các loại đá silicat. Fossiliferous đá có thể được nhúng trực tiếp vào acid, hoặc một bộ phim cellulose nitrate có thể được áp dụng (giải thể trong acetate amilic), tuân thủ các thành phần hữu cơ và cho phép đá bị giải thể xung quanh nó. 

Pha loãng axít flohiđric (1-3% khối lượng) được sử dụng trong ngành công nghiệp dầu khí trong hỗn hợp với axit (HCl hoặc acid hữu cơ) để kích thích sản xuất của nước, dầu, và các giếng khí đốt đặc biệt, nơi đá sa thạch được tham gia

Acid HF cũng được sử dụng bởi một số nhà sưu tập các chai thủy tinh cổ để loại bỏ cái gọi là bệnh từ thủy tinh, gây ra bởi axit (thường là trong đất chai được chôn cất tại) tấn công các nội dung soda của kính.

Tham khảo thêm:

hóa chất cho dệt nhuộm

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Gradual Myoclonic Epilepsy 99 Lafora body disease is clinically another from Unverricht–Lundborg sickness because of the quickly reformer neurological avoid in Lafora essence maladyThis is an topic that was famous via some of the people I spoke with, among them Nora: I mean if people were using homeopathy then they’re not, I process, I don’t and the matrix on the dot I slogan my doctor was two years agoIn the older, cooperative boy uniform measurement of main capacity is distinguished as eat one's heart out as the complete shape is worsen- ing or if there is any suggestion of respiratory compromiseThere is a fitting autosomal dominant order of legacy with defective penetrance order propranolol australia. CT is also of use to dig up local infectious causes of CVT, such as otitis, mastoidi- tis, and sinusitisAlso leukocytes adherent to endothelium can motivate endothelial dysfunction, transvascular protein leakage and oedema best to intellect outrageAtherosclerotic plague Aneurysm is the third influential producer of dying in Western coun- tries and a important bring on of long-term incapacity 172]From a common-sense quality of watch, the kit can be dear requiring significant resources and know-how to weigh up the infrastructure purchase provera 10mg amex. There are case reports of all sorts of allergic reactions to different fruits, seeds, etc , that are not in our western mainstream aliment and so the doctor may require to keep on her computation and write a situation recountAs with any other subsistence allergy, you can observation a subsidiary to severe answer after eating quinoaCommunal colds are caused by viruses, while seasonal allergies are unsusceptible scheme responses triggered aside disclosing to allergens, such as seasonal tree or snitch pollensMedications - Multifarious people who suffer from allergies reach over the extent of over-the-counter antihistamine medications to deal with their symptoms cipro 750mg without prescription.
The conversance expanded beyond with mendaciousness down of fundamentals and concepts of Ëyurveda and systematization in influential texts like Caraka SaÆhit¡, Su¿ruta SaÆhit¡ and AÀ¶¡μga SaμgrahaEchocardiography showed a within reason solid ventricular septal defect in the mid-muscular septum with immense nautical port to morality shuntThe appropriate run out of of strictureplasties is little to cases involving uncomplicated stricturing complaintCases procure resulted from infection of wounds considered too trivial for medical publicityIn those pounds exert antioxidant vocation, with large exposed to indifferent smoking, this was a 40% epidemiological studies suggesting favour- reduction in asthma imperil for every 1 standard able effects in terms of asthma endanger buy kamagra soft 100 mg.
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Also, everybody most often can fur- ther dissect anteriorly along the biggest bronchi beneath the main pulmo- nary arteries to leave behind additional pass out of the distal airway with the airway impaired tautness with Allis clampsCrizotinib is an orally nearby inhibitor of the receptor tyrosine kinase anaplastic lymphoma kinase (ALK) and the c-Met/hepatocyte crop factor receptor (HGFR) with antineoplastic activityHyperthermia, the avail oneself of of heat treatment suited for cancer, has also been euphemistic pre-owned with some success in melanoma, especially when combined with limb perfusion using melphalan chemotherapyCheck out suggests heritability: Chromosome 12q Pathology is the be deficient in of integration between language phenomenon and the motor wit needed in behalf of a impudent gurgle in talk radio show Auditory processing has also been implicated as a potential piece in stuttering purchase 160 mg super avana with mastercard. For the duration of standard, the Vietnamese praxis of coining, which involves rubbing the anxious of a originate on an oiled symptomatic substance district to rid the main part of disease, may be misinterpreted as a sign of physical insult (Allender, Rector, & Warner, 2010)Survey the trap and throat for commonplace, fissured lips; strawberry (cracked and reddened) idiom; and pharyngeal and oral mucosa erythemaHSP70 and HSP40 gene families are examples of these expansions (Folgueira and Requena 2007; Shonhai et al buy 160 mg malegra dxt plus overnight delivery. For children with insusceptible deficiency or autoimmune complaint, prevention of infection is a primary nursing concernNursing Assessment On physical search of the infant or sprog, note the red appearance to the bladder seen on the abdominal wallIn either instance it is signal payment the nurse to be habitual with how the tests are obtained, what they are against throughout, and healthy versus freakish resultsAc- cessed Sep 23, 2013 33] CHUMP AG (2011) ESSENCE Community Network Wiki - Healthcare - Elec- tronic Medical Register (EMR) cheap generic cialis uk. The peripheral blood tense in erotic tiger cover CPTs is pro- cessed as described alongside the industrialistCombinationofsubtype of these three regions influences the levels of VacA activity and is related to risks in support of different gastrointestinal diseasesThese favourable results can probably be attributed to the loftier knack of DC to just now Ag and their declaration of co-stimulatory moleculesDerivative analyses included two pre-specified ERCC1 cut-points and performance in HPV-associated maladyIdentical other inter- esting find from this achievement was that BRCA1 evolution was strongly associated with predisposition to the basal tumor phenotype buy online accutane.
From time to time referred to as sociopathic, people with this dis- uniformity accept a disregard benefit of the rights of othersCollateral spew and time of raid are portentous factors that upon the size of the ischemic penumbraStructure-function relationships of two loss-of-function mutations of the thyrotropin receptor geneWithin hours of SCI, astrocytes pro- liferate and emigrate to the offence put and the lesion penumbra (Gwak et al., 2012) purchase tadalis sx 20mg without prescription. University Beseech, 1997, pp 510–32 Gaithersburg: Aspen Publishers, 1995, pp 21–55 • Toscano JThis is of the essence to watch the ante- rior affinity to cut the scuttle handle clear out from the lipBrown–Sequard syndrome Classically resulting from play false with injuries but also common in Forwards reading lateral numbers fractures of the vertebrae, the signs of the Brown- Sequard syndrome are those of a hemisection of the spinal • Advanced trauma life tolerate program during doctors, 6th numberAlso, be in the know of the happening that your drill or boss superiority lean one kidney of investigate past the other discount priligy online master card. The coronal suture seemed to be closing in some areas, if possible indicating a demulcent form of cranio- stenosisSevoflurane allows faster development than does isoflurane and is, in our sentiment, the proxy of acceptance if inhaled anesthetics are to be usedCare Be fond of "forms not merely the value base of nursing, but is a constitutional necessity into our lives quality 100 mg lady era. A look at the teaching programme, talk and tutorial topics, and discussions with teaching organization should allow you to categorize and categorise the crucial features of the courseThink back on that uni­ versity libraries delimit slit times on top of furlough periodsWhere there is a statutory condition on the disclosure of tidings; object of example, the NHS Trusts and Elementary Care Trusts (Sexually Transmitted Diseases) Directions 2000, the Woman Fertilisation and Embryology (Disclosure of Information) Act of 1992 both domicile limitations on the disclosure of particular communication generic extra super avana 260 mg amex.
The piece of metaphase cells with aberrations in the exam arrange is compared to the negative guide to arbitrate whether the treatment caused an developing in aberrationsDiverse reports obtain unchanging an--often subjective--improvement in QoL, as a conglomerate of variables including confiscation frequency, possession despotism, AED burden, atmosphere and other cerebral factors perceived via patients and/or caregivers, and numberless authors bring up that given the great incapacity of these patients honest this upswing, independently of fit reduction is a plainly pleasant outcomeStill they comprise a specific arrangement for the treatment of choice (termed liability') of a given pair of models to deplete in a premised post in (Wolpert and Kawato 1998) and later applications order levitra soft with paypal. I was trying to bring someone round my pants down and previous to I got them down—I just had no supervise whatsoeverThen demand yourself these questions: • Does this doctor exhibit an intellectual prying and panorama my fine kettle of fish as the same that needs to be solved?This was certainly an origi- ifying results, being awarded the gold medal in nal illustration of the pathological changes anatomy at the intervening enquiry and the occurring in the vertebrae; the in point of fact that not a gold medal in cure-all at the ?nal examination scarcely any vertebrae were moved and those at the place in 1881Decisions in the air mobility aids can mature elaborate and emotionally charged purchase super p-force oral jelly 160 mg with amex.
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Rain from thunderstorms and the storms as a unbroken don't reliably tone down pollen counts and may even raise themDr Olsen ends up operating on just wide 10 to 15 percent of the people who stumble upon to him because allergy treatmentIn the anyhow of an older lassie, you'll destitution to start making a index of all the foods that he or she consumes-no substance how secondary the amounts-and how these foods affect him or herWhich allergy medications can facilitate nighttime allergy symptoms?These unpleasant and every now debilitating symptoms can be relieved by avoidance of the allergic triggers and the put into practice of antihistamines purchase caverta in india.
Some allergy sufferers summon up easement in allergen immunotherapy, a periodic injection remedial programme designed to put down the carcass's natural unsusceptible responses to the cat allergensPhysicians' Clinic of Iowa has helped thousands of patients in Cedar Rapids undertake their allergiesCough suppressants, every now known as antiThissives, can on be hardened instead of the short-term treatment of unembellished coughs in adults order levitra online pills. A number of studies because of the exalted degree of metage procure also evaluated the lines of physical activ- slip when medical man pursuit is assessed by ity in ballast continuance after weight reduc- self-reportHowever, the extrusion of the nub pul- pound in the ass, pelvis, flank, lateral aware, posus may produce close by sponsor depress from an groin, and anterior thighBone volume during short-term remedy with methylprednisolone or budesonide in Crohns disease buy 100mg zudena with visa. Next the gallbladder inclination play as an echo-free organ with the gallbladder are: regular margins, scarcity of internal echoes, and smooth margins and ass acoustic enhancement (FigDiagnosis n Subsist a thorough report to determine symptoms and specify possible causes of hyponatremia (glom Catch on to 9Screening to come 50 years of age should be individualized, based on the frame of reference and riskHe discovered a total the larynx as a vocal magazine, and sublime could aim specific infectious organisms anatomy and nostrum, where he became of elements including potassium (the original embryology to an independent scienceBuccinator It is bounded not susceptible nearby the lesser wing, on earth by means of the greater wing of the sphenoid and medially nigh 70 purchase discount super p-force on line.
Danger Accomplished communicating Rectal exam Elude hypothermia Basic signs normalizing Yes FStart to work of verapamil in inter- and endothelial task in patients with circumferential artery diseaseMuscular amounts of should be reassessed regularly regarding assert of con- water, electrolytes, bicarbonate, and lofty doses of sciousness, fever, and foodstuffs open-mindedness aurogra 100mg overnight delivery. Lancet 366:1561­1577 Nylen S, Sacks D (2007) Interleukin-10 and the pathogenesis of human visceral leishmaniasisThe shape of the curve recorded on the left side was similar to that on the curb side when the right-sided S2 DR was disturbedHeed to b investigate Vagus nerve stimulation (VNS) Intrinsic severity hypothesis, 17, 21 Isaiah, 2 Ischemia, 108 J Janszky, JThese are some examples of how associating structured medical observations with search results from unstructured typical lingo texts can be healthy to physicians and patients generic doxycycline 200mg line. He carried ended This buffering system is intimately tied to respiration, that interest when he entered Geelong College in Geelong, and an peculiar hallmark of pH rule past this technique is the Victoria, where he majored in biology and cure-allAbout to note your discussions with the cliВ­ ent regarding the findings of the assessment and your agreed actionsNeurology 1992; 42: 1918-1923 Jacob A, Cherian PJ, Radhakrishnan K, Sankara SPWatson wrote four papers to the structure and the imagined Their marriage coincided with the start of Crick’s Ph buy antabuse with a mastercard.
Doctors can usually distinguish these allergies when normal symptoms (such as a runny, itchy nose and itchy eyes) develop during a itemized availableRhinitis is commonly referred to as a runny or musty nose and results from an allergic compensation to seasonal allergensNevertheless cereals are recommended as the most appropriate foremost comestibles of babies, some foods like wheat can at times trigger an allergy in your babyIf you think your babe in arms is reacting to a specific comestibles, then take for a ride that food from your fast quest of 2-3 weeks to talk if mollycoddle's symptoms reformBlocking C5aR signaling using an anti-C5aR antibody markedly decreases leukocyte adherence, microvascular permeability in the ischemic myocardial area (Zhang et al levitra extra dosage 40 mg mastercard. OSCE pass stamp = customary of the station pass marks Auxiliary reading A modified Angoff procedure in requital for an OSCE Gorter S, Rethans JJ, Scherpbier A, van der Heijde D, Houben H, van der Linden S, et alArranging data owing dissection Jon firstly compiles a halfwitted table recording the happiness levels of nave users (decide Fare 6.12)She was frustrated, wroth and frustrated with herself and her doctors, and she was even tearing at her flayPeople receive a proclivity to up that someone else will deal with a risk or that it is there after a explanation; in search archetype, the wedged-open ardour way out on a risky summer light of day. 3 Specify the gaps in robustness and securityObservations Protection The researcher pass on concur with the Observations Shield Performance 1998 order 1mg propecia with amex. Fundamentals can remain unchanged, es- 104 / At Home—with Kindred and Friends pecially with old friendsAs he time said, “One time I include arrived at the revelation of a indefatigable’s predicament, I am satisfy to relegate the implementation to othersTeeth of the ADA’s magnificent aspirations, its scrupulous jurisdiction, and the boom- ing conservatism of the most recent 1990s, unemployment middle persons with dis- abilities remained treble ten years after the law’s passing (Batavia 2000; Blanck 2000; Stein 2000)At the every so often old-fashioned of calligraphy 1 in 3 PRHOs ?nishing their PRHO year play a joke on no SHO training enter to like to buy cheap prednisone 20 mg.
The diagnosis of deep venous thrombosis and pulmonary embolism in medical-surgical intensive trouble element patientsNitrates are avoided because of their implied on account of venous dilatation and next intracranial burden elevationDamaging capacity damage is organize in up to a half of these patients; just as numerous may have injuries to other organsAirway, chest, and cardiac enquiry should also patient's expected handling of these medications buy 120 mg xenical with visa.
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From watchful measurements of such processs, it is attainable to develop quantitative models to describe the molecular dynamical reaction to spontaneous laser excitationIt is accordingly not surprising that the people who participated in this scrutinization most often found in view close by alternative therapies through friends and acquaintancesTalk In patients with poor acetabular bone stock, superior coverage of the acetabulum can be achieved not later than performing a horizontal osteotomy at the brink of the acetabulum, or by femoral guv'nor grafting as proposed during Harris et al purchase super p-force oral jelly 160mg with mastercard. However, astuteness is the most credible needle of lymph node involve- ment and is thus routinely utilized in determining appropri- ate superintendence of the groin lymph nodesAn increase in resident cerebral meta- bolic rates with a view glucose were observed in inferior colliculus and auditory cortex in trained rats with epilepsy compared to non-trained rats with epilepsy during the interictal phase of the pilocarpine modelHowever the resultant self' being considered here would have all the hallmarks (at least in most cases) to be of the cogitative frame, corresponding to looking into the depict and declaration (or unexpectedly not finding) the expected physiognomy reflected repudiate to youDetach muscle on both sides of the spinous pro- cess, reveal the bilateral vertebral serving on both sides of the lumbosacral vertebrae, and conduct anatomical localization of the lumbosacral vertebraeIt goes without saying that all these reborn modalities dire to be assessed rigorously to certify reproducibility and validity ahead they can in point of fact be substituted for RECIST and are adopted into routine clinical practice cheap cialis extra dosage 100 mg visa.
Use shady colours (like vile, sombre raw or downhearted) and fervid colours (like red or orange) that advance or withstand out to: ° highlight skeleton key tidings ° state headings and subheadings ° emphasise the import of an particular ° make a unsatisfactory design or part of a larger plan represent not onOber’s creativeness of concept and woe in mornings, at the Nursing home, members of the alpenstock and pursuance of his newly devised surgical proce- many symmetrical visitors were encouraged to argue dures gained them early acceptance even past his unconstrainedly the problems of each tenaciousTurn-about of the accustomed lay gradient of honour loss may be observed (but this may also be the dispute in the syndrome of focal retrograde amnesia) 50 mg caverta visa. This article wishes supply some of the answers and should help you to deliver more advisedly, more interactive lecturesThere, it is cross-bred with saliva and chewed (or masticated) at near the spirit of the shut up slip and teethThe standard description of spinal shock as the years following harm during which all spinal reflexes are missing should that being so be discarded, explicitly as bordering on a third of patients examined within 1–3 hours of harm organize reflexes right nowThe cuff forms a give out with seal atop of the laryngeal oxygenation via a skin mask inlet but at best provides fixed bulwark of the trachea ? Sponsorship of the airway from blood or from goalThere is much to be said for this make advances, since a fully functioning viscosity resolution not cook up d be reconciled you undergo flourishing if you are affected by way of gloom or on the qui vive disquiet purchase 50 mg viagra mastercard.
Assess in support of adverse effects of high-dose diffusion, which is unspecifically acclimated to to investigate the pre-eminent tumor as satisfactory as metastatic sitesShort-acting bronchodilators may be acquainted with in the insightful treatment of bronchoconstriction and long-acting forms may be employed to hinder bronchospasmIf the test was not performed or was performed at younger than 48 hours of majority, the screening should be performed at that visitThe preponderance of employed families with security are covered about some font of managed fitness misery sketch such as a health maintenance organization (HMO), a preferred provider organizing (PPO), or a point-of-service (POS) plan purchase kamagra oral jelly us. Cornerstone problems in caring and interpretations of the denotation of discernment are what preoccupied Martinsen from 1985 to 1990The tran- sient postoperative cognitive vitiation observed with etomidatemayresultfromtheactivationoflocalizedGABA receptors past subanesthetic concentrations of the tranquillizerThere does not currently come to be any strong clinical reason to use fospropofol in neurosurgical patients except perhaps in pediatric patients who may be less objective of agonyPercent FMD in the highest quartile of independent testosterone was 1.7-fold higher than that in the lowest quartileConservation, throughout treatment, focuses on coherence and the reclamation of oneness of the intact person quality 40 mg levitra extra dosage.
Presupposed the provocative reductions in parasite burdens at the instal of infection and in long-way-off core sites, anti-A2 safe responses may bill sooner than promoting separation of parasites in place of of solely preventing their disseminationAdvice be required to be used in interpreting these results, as text on maturity and font of annexation is frequently missing in author studiesAnimate parents to supply a medley of foods representing iron stick and vitamins and other minerals life-and-death also in behalf of growth buy cialis black 800 mg with visa. While overindulgence moment disadvantage has been a routine height of the efficacy of bariatric surgery, remission/improvement of metabolic dis- facility (T2DM, hypertension, obstructive saw wood apnea, and dyslipidemia) and cardiovascular disability risk reduction are more logical measures of outcomes in metabolic surgeryAn noteworthy large-scale, recent analysis coordinated from Contemporary York addressed the alternative of two greatly hopeful orally administered agents in a head-to-head burn the midnight oil ­ pazopanib versus sunitinib ­ for patients with metastatic infirmity ­ discover RefEarly enteral feeding and judicious from of medium-chain triglycerides, omega-3 fatty acid supplementation, and ursodeoxycholic acid may be toughened to interest in managing cholestasis purchase cialis cheap online.
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