A solution is prepared by dissolving 0.23 mol of hydrofluoric acid and 0.27 mol

Q: A solution is prepared by dissolving 0.23 mol of hydrofluoric acid and 0.27 mol

answer : C. hydrofluoric acid explanation: buffer is the mixture of HF and NaF on addition of acid H+ react with F- H+ + F- --------------> HF on addition of base OH- react with HF HF + OH- --------------> F- + H2O so there is no change in either HF and NaF concentration apprecibly because F- is already part of buffer

ID: 990181 • Letter: A

Question

A solution is prepared by dissolving 0.23 mol of hydrofluoric acid and 0.27 mol of sodium fluoride in water sufficient to yield 1.00 L of solution.The addition of 0.05 mol of NaOH to this buffer solution causes the pH to increase slightly. The pH does not increase drastically because the NaOH reacts with the __________ present in the buffer solution. The Ka of hydrofluoric acid is 6.8 × 10-4.

A. fluoride

B. H2O

C. hydrofluoric acid

D. H3O+

E. This is a buffer solution: the pH does not change upon addition of acid or base.

Explanation / Answer

answer : C. hydrofluoric acid

explanation:

buffer is the mixture of HF and NaF

on addition of acid H+ react with F-

H+ + F- --------------> HF

on addition of base OH- react with HF

HF + OH- --------------> F- + H2O

so there is no change in either HF and NaF concentration apprecibly because F- is already part of buffer

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A solution is prepared by dissolving 0.23 mol of hydrofluoric acid and 0.27 mol

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