(A) A 1.00 L volume of buffer is made with concentrations of 0.350 M NaHCOO (sodium formate) and 0.550 M HCOOH (formic acid). 

(a) What is the initial pH? 

(b) What is the pH after the addition of 0.0050 mol HCl(aq)? (Assume that the volume remains 1.00 L.) 

(c) What would be the pH after the addition of 0.0050 mol NaOH to the original buffer?

(B) How many milliliters of 6.0 M HNO₃ would you add to 300.0 mL of the buffer solution of Example 17-6 to change the pH from 5.09 to 5.03?

Example 17-6

What are the effects on the pH of adding (a) 0.0060 mol HCl and (b) 0.0060 mol NaOH to 0.300 L of a buffer solution that is 0.250 M CH₃COOH and 0.560 M aCH₃COO?