Question

If the KHP was not kept dry prior to its use for this experiment, how would...

If the KHP was not kept dry prior to its use for this experiment, how would moisture affect the calculated concentration of the NaOH solution?

If it takes 16.39 mL of an unknown concentration aqueous solution of NaOH to neutralize 1 g of pure benzoic acid (C7H6O2), then what is the molarity of the NaOH solution?

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Answer #1

KHP (Potassium Hydrogen Pthalate) is used to standardize NaOH solution. If KHP is not kept dry it shall contain mass of water also in it. Now when we use a certain mass of KHP to standardize the NaOH solution, we calculate the Molarity on a mole basis. The KHP used for standardizing will end up apparently having more number of moles because the number of molecules of KHP present in 1g of the wet KHP is less than that of the dry one. So the concentration of NaOH would be incorrect. And because of the higher moles in the wet KHP the calculate concentration of NaOH would be more than actual.

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