Question 11 1 pts Determine the pH of a buffer made by mixing 0.040 mol HF...

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Answer 1

Answer #1

mixture of HF and NaF act as acidic buffer

for sch buffer

pH = pKa + log [NaF] / [HF]

pKa = - log Ka = - log 8.5 x 10^-4 = 3.07

[NaF] = 0.05 / 4.0 = 0.0125 M

[HF] = 0.040 / 4.0 = 0.01 M

pH = 3.07 + log [0.0125] / [0.01]

pH = 3.17

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Answer 2

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