A 35.0 mL of 0.225 M HCNO was titrated with 0.215 M KOH. Determine the volume of 0.215 M KOH necessary to reach the equivalence point. Calculate the pH after the addition of 85.0 mL of the base. The pK_a for cyanic acid is 3.46.

The following are representations of the initial concentrations of a weak acid HA (pKa = 6.15) and its potassium salt KA. Draw a representation of the equilibrium state of solution (4) upon the addition of 1 OH⁻ ion. (The potassium ions and water molecules were omitted for clarity).  

At the equivalence point, what is the pH of the resultant solution obtained in a titration of 20.0 mL of 0.178 M acetic acid with 0.150 M NaOH?

A 30.0 mL sample of 0.100 M benzoic acid (C₆H₅COOH) is titrated against 0.100 M NaOH. Calculate the pH of the solution at the endpoint. (K_a of benzoic acid = 6.31×10^-5)