1. a compound has a pka of 7.4 to 100 ml of a 1.0M solution of this compound at pH 8.0 is added 30 ml of 1.0M HCl..what is the reslting solution pH?

2. a 1.0M solution of a compound with 2 ionizable groups (pka's= 6.2 and 9.5; 100 ml total) has a pH of 6.8. if a biochemist adds 60 mL of 1.0M HCl to this solution, the solution will change to wht pH?

3.a compound is known to have a free amino acid with pka of 8.8 and one other ionizable group with pka btween 5 and 7. to 100ml of a 0.2M solution of this compound at pH 8.2 was added 40 ml of a solution of 0.2m HCl. the pH changed to 6.2. the pka of the second ionizable group is?