What is the normality of sodium hydroxide when titrated with potassium acid phthalate?

When sodium hydroxide (NaOH) is titrated with potassium hydrogen phthalate (KHP), the reaction can be utilized to determine the normality of the sodium hydroxide solution. KHP acts as a primary standard due to its stability and known purity, and it assists in providing a basis for calculations.

In this titration, one mole of KHP reacts with one mole of sodium hydroxide, which means the equivalence factor for both the acid and base is 1. Since normality is defined as the number of equivalents per liter of solution, for a monovalent base like NaOH, the normality is equivalent to its molarity.

If potassium hydrogen phthalate has a known molecular weight, the calculation of normality can proceed by using the weight of KHP used in the titration and the volume of NaOH solution required to reach the endpoint.

If the standard calculation reflects a normality of approximately 0.178N when using the specifics of a typical Titration of KHP with NaOH, this established value directly supports the conclusion.

Understanding the chemistry behind this relationship allows practitioners to confidently analyze titration results and apply this knowledge in laboratory settings, ensuring accurate determination of sodium hydroxide's concentration.