The additional NaOH needed for hydrolysis is approximately 13.05 mL.
In this titration scenario, 13.05 mL of sodium hydroxide (NaOH) was initially used to neutralize all the acid present. To proceed with hydrolysis, additional NaOH is required to ensure that the hydrolysis reaction reaches completion. The amount of additional NaOH needed is precisely the same as the initial volume used in the titration, which is 13.05 mL.
This is because the hydrolysis of a salt involves the addition of hydroxide ions, and the initial titration volume indicates the amount needed to neutralize the acidic component. Therefore, to achieve complete hydrolysis, an additional 13.05 mL of NaOH is added, ensuring that all acid is neutralized and the hydrolysis reaction proceeds to completion.