Question

A 25.00 mL sample of 0.260 M NaOH analyte was titrated with 0.750 M HCl at 25 °C.

Calculate the initial pH before any titrant was added.

pH=

Calculate the pH of the solution after 5.00 mL of the titrant was added.

pH=

2. The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted. If 0.560 moles of a monoprotic weak acid (ka=8.6x10^-5) is titrated with NaOH, what is the pH of the solution at the half equivilance point?

pH=

3.Calculate the pH at the equivalence point for the titration of 0.240 M methylamine (CH3NH2) with 0.240 M HCl. The Kb of methylamine is 5.0× 10–4.