Determine the molarity of a solution of sodium hydroxide (NaOH) when 23.64 mL of this solution is required to neutralize the 0.5632 g of potassium phthalate.
It is found that the 24.68 mL of 0.1165 M NaOH is required to titrate the 0.2931 g of an unknown acid to the phenolphthalein the endpoint. Analyze the equivalent mass of the acid.