1. A 15.9 mL sample of a 0.333 M aqueous acetic acid solution is titrated with a 0.383 M aqueous potassium hydroxide solution. What is the pH at the start of the titration, before any potassium hydroxide has been added? pH =

2. When a 28.4 mL sample of a 0.419 M aqueous nitrous acid solution is titrated with a 0.426 M aqueous sodium hydroxide solution, what is the pH after 41.9 mL of sodium hydroxide have been added? pH =