For this problem, we have to calculate the pH when 49.5 mL of 0.335 M NaA is mixed with 30.6 mL of 0.120 M HCl.
Step 1. Find the moles of F- and HF
Step 2. Calculate the pH using HH equation
(1) Moles of A- will be calculated as:
Calculate the pH of a solution prepared by mixing 50 mL of a 0.10 M solution of HF with 25 mL of a 0.20 M solution of NaF. pKa of HF is 3.14.