Note that the total volume- initial plus the added 10.0 mL- must be used. This concentration yields a pH of
The pH level has increased, as is expected with the addition of a basic solution.
(3) How many titrations are necessary to reach the equivalence point?
Equation (6) found that the initial number of millimoles of hydronium ions was 4.0. In order to reach a pH of 7, an equal number of millimoles of hydroxide ions (and thus of potassium hydroxide) must be added. For a .15M solution, the volume that gives 4.0 mmol is
