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

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