1. The problem statement, all variables and given/known data Trimethylamine has a Kb of 6.3 x 10-5. How many liters of HCl gas, measured at 1.20 bar and 298 K, must be added to 250.0 mL of 0.500 M trimethylamine to give a pH of 10.30? 2. Relevant equations 3. The attempt at a solution I don't know where to start because I don't know how the gaseous HCl affects the pH.