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algol [13]
4 years ago
14

Calculate the pH of a buffer solution prepared by mixing 200 mL of 0.10 M NaF and 100 mL of 0.050 M HF.

Chemistry
1 answer:
dlinn [17]4 years ago
8 0

Answer:

pH=3.74

Explanation:

Hello,

In this case, by using the Henderson-Hasselbach equation one could compute the pH considering that the pKa of hydrofluoric acid, HF, is 3.14:

pH=pKa+log(\frac{[base]}{[acid]} )

Whereas the concentration of the base and acid are computed by considering the mixing process with a total volume of 300 mL (0.3 L):

n_{HF}=0.1L*0.05mol/L=0.005molHF\\\\n_{NaF}=0.2L*0.1mol/L=0.02molNaF

[HF]=\frac{0.005molHF}{0.3L}=0.017M

[NaF]=\frac{0.02molHF}{0.3L}=0.067M

Therefore, the pH turns out:

pH=3.14+log(\frac{0.067M}{0.017M} )\\\\pH=3.74

Regards.

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