inorganic chemistry - Why is the solution of ammonium bifluoride …
2021年2月23日 · Dissociation equilibria of ammonium bifluoride in water $\endgroup$ – Mithoron. Commented Feb 23, 2021 ...
Dissociation equilibria of ammonium bifluoride in water
2021年2月23日 · Ammonium bifluoride or ammonium hydrogen fluoride is a salt of a weak base and a weak acid. The weak acid is because the second equilibria of $\ce{HF}$ written as: $$\ce{HF + F- <=> HF2-}$$ and it has constant of $\pu{3.963 M}$. But does the bifluoride anion further dissociate?
inorganic chemistry - Why Ammonium bifluoride is used in the …
2020年11月19日 · When brass solution (mixed with nitric acid and urea) is to be estimated for amount of copper present, ammonia is added to neutralize the solution. This gives a turbidity which can be dissolve by adding ammonium bifluoride (NH4HF2). What exactly causes the turbidity? Which compound formation is responsible for the turbid appearance?
How can I calculate the amount of HF in aquoues solution of …
2020年3月23日 · $\begingroup$ The NH4F and NH4HF2 are two separate solutions, c(NH4F)=5M, and c(NH4HF2)=0.18 M. For each of these solutions, that are not mixed I need to determine the concentration of HF.
Why does glass etching cream contain sulfuric acid?
2022年12月7日 · Ammonium Bifluoride - 20 - 40%; Sodium Bifluoride - 5 - 10%; Sulphuric Acid - 1 - 5%; Barium Sulfate - 1 - 5%; The purpose of the fluoride ingredients is obvious. They decompose into hydrofluoric acid (presumably when reacting with water in the air) and do the actual etching. But why is there Sulphuric Acid? It doesn't react with glass at all.
organic chemistry - Why is the pH of this ammonia solution more …
2022年8月15日 · I made two similar ammonia solutions in different ways, and they resulted in different pH, but i'm not sure why. Solution 1 Added 5.84 g NaCl to a 500 mL flask. Then added 10 mL 25% ammonia solution.
inorganic chemistry - In which state does the bifluoride anion exist ...
2014年2月17日 · Because of this capture of a proton ($\ce{H+}$), bifluoride has basic character. Its conjugate acid is the reactive intermediate, μ-fluoro-fluorodihydrogen ($\ce{H2F2}$), which subsequently dissociates to become hydrogen fluoride. In solution, most bifluoride ions are dissociated. $\ce{HF2- + 3H2O}$ is in a favored equilibrium with $\ce{2H3OF ...
inorganic chemistry - Why does potassium bifluoride exist whereas ...
2023年3月13日 · The bichloride ion, including isolated salts, has in fact been known since 1954 ; but it appears to require relatively bulky counterions whereas bifluoride has a broader range of stable salts.
Why is ammonium a weak acid if ammonia is a weak base?
2016年12月29日 · $\ce{NH3}$ is a weak base so I would have expected $\ce{NH4+}$ to be a strong acid. I can't find a good explanation anywhere and am very confused.
Identifying a glass frosting chemical - Chemistry Stack Exchange
The most common glass-etching powders are solid ammonium bifluoride and solid potassium bifluoride. See for example the Material Safety Data Sheet for “EtchON Acid-Frost Glass Frosting Powder”, or this one. This is not a definite identification, but it fits your description, and those two are the most commonly available such chemicals.