Problem: What is the pH of a buffer that is 0.6 M HF and 0.2 M NaF? The Ka of HF is 6.8 × 10−4.a. 3.65b. 2.69c. 3.17d. 3.50

FREE Expert Solution

We have to calculate the pH of a buffer that is 0.6 M HF and 0.2 M NaF.

HF is a weak acid which dissociates partially in an aqueous solution to produce H3O+ and F- ions.

HF(aq) + H2O(l) F(aq) + H3O+(aq)

The fluoride ion (F-) produced as a result of HF dissociation is the conjugate base of HF.

We will use the Henderson-Hasselbalch equation to solve this problem.

pH = pKa + logconjugate baseweak acid


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Problem Details

What is the pH of a buffer that is 0.6 M HF and 0.2 M NaF? The Ka of HF is 6.8 × 10−4.

a. 3.65

b. 2.69

c. 3.17

d. 3.50