To learn more, see our tips on writing great answers. Who is the longest reigning WWE Champion of all time? In soil (pH<6), fluoride is predominantly found in as complexes such as fluorspar, cryolite and apatite and clay minerals. So my question is can somebody explain how to properly get the correct pH values, or confirm what they are. It isn't discussed enough here. How to get an update of deleted file on host machine only with rsync. What is the reflection of the story the mats by francisco arcellana? The pH of hydrogen fluoride is slightly over 7. PostgreSQL - CAST vs :: operator on LATERAL table function. Viewed 3k times 0. The pH of hydrogen fluoride is slightly over 7. rev 2020.11.24.38066, The best answers are voted up and rise to the top, Chemistry Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Not directly pertinent to the question proposed, however...Simply would like to point out that if you do not know what you are doing/are not comfortable handling, HF can be VERY dangerous so please ensure you have the proper protective equipment [for example, simply inhaling a small amount can destroy your vocal cords...], I very well know how to work with HF, we have all the facilities, there's just a bunch of different values regarding pH to be found (a value usually not necessary to know when working with HF). In surface water at environmentally relevant pH, hydrogen fluoride will dissociate almost entirely to form hydronium and fluoride ions. Is there a way to search all eBay sites for different countries at once? It has a molecular weight of 20.01 and can typically be found in concentrations of 48-52% in … In chemistry, pH (/ p iː ˈ eɪ tʃ / ... For example, for a solution with a hydrogen ion activity of 5×10 −6 (at that level, this is essentially the number of moles of hydrogen ions per litre of solution) there is 1/(5×10 −6) = 2×10 5, thus such a solution has a pH of log 10 (2×10 5) = 5.3. Sure, I didn't mean any disrespect, just wanted to make sure. New “Touched” feats, what exactly does ‘appropriate level’ mean? Both versions are commonly referred to as HF in research and industry. Hydrogen fluoride readily dissolves in water to form colorless hydrofluoric acid solutions; dilute solutions are visibly indistinguishable from water. I just wouldn't be working with it if I was not safe. Making statements based on opinion; back them up with references or personal experience. So other options to achieve this from stock $\ce{HF}$ (49%) with standard chemicals is also an option, however $\ce{NaF}$ is not readily available for me (mostly only access to solutions, such as $\ce{NH4OH}$). In water, it will ionize slightly, giving an exact pH of 7.2x10^-4. Thanks for contributing an answer to Chemistry Stack Exchange! If a piece of software does not specify whether it is licenced under GPL 3.0 "only" or "or-later", which variant does it "default to"? It only takes a minute to sign up. I was able to get some rough pH indicators that are allowed in our lab (cleanroom environment). Hydrofluoric acid (CAS#7664-39-3) is the aqueous form of hydrogen fluoride gas, miscible with water. for a quick calculation see: Is it too late for me to get into competitive chess? I found that a method I was hoping to publish is already known. How long does a fresh turkey last in the refrigerator? Asking for help, clarification, or responding to other answers. Why is melted paraffin was allowed to drop a certain height and not just rub over the skin? will ionize slightly, giving an exact pH of 7.2x10^-4. All the calculations based on a value for the $K_a$ of HF acid assume that the concentrations equal the activity of the species. What is the conflict of the story of sinigang? However if you calculate this using the $K_a$ of $6.8\times 10^{-4}$, you would get about 1.5 pH, which is quite the difference. Hydrogen fluoride is a chemical compound with the chemical formula H F. This colorless gas or liquid is the principal industrial source of fluorine, often as an aqueous solution called hydrofluoric acid. How do rationalists justify the scientific method. polytetrafluoroethylene (Teflon). Also, secondary I would like to create a buffer solution with HF having a pH within the range of 4-7 (specific etching chemistry, $\ce{SiO2}$ vs $\ce{HfO2}$, not etching $\ce{HfO2}$). How long was Margaret Thatcher Prime Minister?


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