If 50.0 ml of naoh solution is required to react completely with 1.24 g khp, what are the molarity and normality of the naoh solution?

- Molarity = 0.121M and normality = 0.121N.

Solution:- KHP that is potassium hydrogen phthalate reacts with sodium hydroxide as:

From this equation, they react in 1:1 mol ratio. Grams of KHP are given so we could convert them to moles and the moles of NaOH would also be equal since the mol ratio is 1:1. Molar mass of KHP is 204.2 gram per mol.

= 0.00607 mol NaOH

Volume of NaOH solution is 50.0 mL that is 0.0500 L. Molarity is moles of solute per liter of solution. So, let's divide the moles by the liters to get the molarity.

= 0.121 M

The molarity of NaOH solution is 0.121 M.

Normality is the grams equivalent per liter of solution.

For a base, normality = molarity* acidity

acidity means how many hydroxide ions would be given out from the base. It could also be calculated on dividing the molecular weight of the compound by it's equivalent weight.

Acidity of NaOH is 1 as it has only one OH present in it.

So, normality = 0.121(1) = 0.121 N

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