A Few More Buffer Problems
1. Calculate the pH of each of the following buffer solutions:
a. 0.50M C2H5NH2 / 0.25M C2H5NH3Cl
b. 0.25M C2H5NH2 / 0.50M C2H5NH3Cl
c. 0.50M C2H5NH2 / 0.50M C2H5NH3Cl
2. Which of the solutions from question #1 have a greater buffer capacity? Explain
3. Calculate the pH after 0.010 mol of HCl is added to 250.0ml of each of the following buffered solutions:
a. 0.050M NH3 / 0.15M NH4Cl
b. 0.50M NH3 / 1.50M NH4Cl
4. How do the solutions in #4 differ in pH before adding HCl and in buffer capacity?
5. Which of the following solution(s) can act as a buffer? Explain.
a. KCl / HCl
b. KHSO4 / H2SO4
c. Na2HPO4 / NaH2PO4
d. KNO2 / HNO2
6. Calculate the pH of a buffer system made up of 0.15M NH3 / 0.35M NH4Cl