NEED HELP!! Please!!?

Question

A buffer solution is 1.00 M in HF and 1.20 M in NaF. If 0.100 moles of HCl are added to 1.00 L of the buffer, what is its pH? Assume the volume remains constant. Ka of HF = 7.2 10-4.

Answer 1

Since HCl is a strong acid, and HF is weak, you can take it that all the HCl reacts with F- to convert it to HF.

So find the new values of [F-] and [HF], and use whatever method you like (definitions, or H-Hasselbach eqn) to find the pH.

It won't have changed much;that's the whole pointabout buffers.