1. What is the chemical definition of a buffer solution? Give an example.
2. The Ka of benzoic acid C7H5O2H, IS 6.5X10^-5. What is the buffer range?
3. How many g of sodum benzoate, NaC7H5O2, should be mixed with 3.00 moles of benzoic acid, C7H5O2H, (Ka=6.5x10^-5) in a 5.0-L to make a solution that has a pH of 3.5?
4. Calculate the pH of a solution prepared by mixing 30.00 mL of a 0.15-M KOH solution with 50.00 mL of a .39-M HBr solution.
5. 45.0 mL of a 0.10-M formic acid (HCHO2, Ka=1.7x10^-4) solution was titrated with a 0.20-M NaOH solution. What is the equivalent volume? Calculate which is in excess.
6. What is the pH of the acidic solution before titration?
7. What is the pH of the reaction mixture (in Question 6) after 10.0 mL of NaOH was added?
8. What is the pH of the reaction mixture (titration in Question 6) at the equivalence point?
9. What is the pH of the reaction mixture (titration in Question 6) after 25.0 mL of base was added?