A compound has carboxyl group, an aminium group, and aguanidinium group. The pKas of the groups are 3.6, 9.7,and 12.8, respectively. A biochemist has 100 mL of a 0.10 Msolution of this compound at a pH of 9.2. She adds 37 mL of 0.1 MHCl. To the nearest hundredth of a unit, what will be the pH of thesolution after addition of the HCl (assume full stirring to reach anew equilibrium)?
