Question

Pure potassium hydrogen phthalate is used for the standardization of the sodium hydroxide solution. Suppose that the potassium hydrogen phthalate is not completely dry. Will the reported molar concentration of the sodium hydroxide solution be too high, too low, or unaffected because of the moistness of the potassium hydrogen phthalate?

Answer 1

Answer:

Too high

Explanation:

The standarization of sodium hydroxide solution with potassium hydrogen phthalate consist in the addition of known quantity of moles of acid by weighing this solid.

If the solid is moist, the real mass of the acid will be less than weighed doing less the real moles of potassium hydrogen phthalate. Thus, in titration, volume of NaOH will be less than real volume and reported molar concentration will be too high.

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