When standardizing the base, using KHP, what would be the effect on the molarity

Question

When standardizing the base, using KHP, what would be the effect on the molarity of the NaOH solution if some of the solution was accidentally spilled in filling the buret? Is it necessary to know exactly how much water is used to dissolve the samples of KHP or the acid unknowns in each titration? Explain. Suppose some of your unknown sample has failed to dissolve even after you have titrated to your end point. What effect would this have on the calculated molecular weight of your unknown? Explain.

Explanation / Answer

Step I

Molarity = Moles of Solute / Volume of Solution in Liters

Step II

Because of spillage, there will be no change in the molarity of the solution. Volume is decreased at the same time number of moles will also get decreased and which results in the same ratio of above formula.

Step III

Yes it is necessary to know the volume of water used since the concentration of KHP changes on addition of water since the volume is increased. It can be calculated using formula -

M1V1 = M2V2

As the number of solutes remain same but there is increase in the total volume of the solution after addition of water, it results in decrease in the molarity of the solution.

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