sergiom2860 sergiom2860

21-11-2017
Chemistry

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Calculate the ph of a solution that is 0.26 m in hf and 0.12 m in naf.

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meerkat18 meerkat18

01-12-2017

When a mixture consists of a weak acid, such as HF, and its corresponding salt, NaF, this is an acid buffer. So, we can use the equation as written below:

pH = pKa + log(salt/acid)

For HF, the pKa = 3.17

Thus,
pH = 3.17 + log(0.12/0.26)
pH = 2.83

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