Homework Janurary 12

Homework today is the two example problems in the chapter 17 notes packet under Addition of Strong Acids or Bases to Buffers.

For those who have misplaced said notes here are the problems:

1. Consider a buffer prepared by placing 0.60 moles of HF (Ka = 7.2 x 10-4) and 0.48 moles of NaF in a 1.00 L solution.

a) Calculate the pH of the buffer
b) Calculate the pH after addition of 0.08 moles of HCl
c) Calculate the pH after the addition of a total of 0.16 moles of HCl
d) Calculate the pH after the addition of 0.10 moles of NaOH

2. Consider a buffer containing 0.78 moles of HC2H3O2 (Ka = 1.8 x 10-5) and 0.67 moles of NaC2H3O2 in 1.00 L of solution.

a) Calculate the pH of the buffer
b) Calculate the pH after addition of 0.10 moles of HNO3
c) Calculate the pH after the addition of a total of 0.20 moles of HNO3
d) Calculate the pH after the addition of 0.10 moles of NaOH