What happens when NaF is added to HF?
Answer:
The previous answer refers to SOLUTIONS of NaF and HF. If pure NaF is added to HF a reaction occurs in which the HF molecule hydrogen bonds so strongly to the fluoride ion that a the ion FHFˉ is formed: F-H..Fˉ . So the overall reaction is:
NaF + HF --> NaFHF
The product is known as sodium hydrogenfluoride or sodium bifluoride. It is used as protective agent for food, conserving agent and antiseptic agent for animal specimen and dissection specimen; also used in glass etching, tintype making, textile treatment, rust removing and the production of tin plate, etc.
WE get a buffer solution.
A buffer solution can consist of a weak acid ( in this case HF K = 6.7 x 10^-4) and one of its salts (NaF).
To determine the pH of this solution you can use the equation
pH = pK + log [ F-]/[HF]
Any solution containing an appreciable amount of HF and F- provides buffering action against added H+ ( which woud be picked up by free F- ) or against added OH- ( which would be neutralized by HF )
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