A solution with a volume of 75.0 mL contains 15.5 mmol HCHO2 and 8.50 mmol NaCHO2.
a. What is the pH of this solution?
b. If 0.25 mmol Ba(OH)2 is added to the solution, what will be the pH?
c. If 1.05 mL of 12 M HCl is added to the original solution, what will be the pH?