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If molarity is to be kept the same and the volume of solution is doubled, what change is needed in moles of solute?

Answer and explanation

Correct answer: Moles must also be doubled

Molarity is the ratio M = n/V. If the volume is doubled while the amount of solute remains unchanged, the molarity becomes one-half of its original value. To keep M constant, the numerator must increase in the same proportion as the denominator. Therefore, when the solution volume doubles, the moles of solute must also double. Option A is correct; halving or leaving the moles unchanged would reduce molarity.

Related tags

MolarityProportional ReasoningSolute AmountSolution ConcentrationMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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