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200 mL of 3 M acid is mixed with 400 mL of 1.5 M same acid. Assuming final volume is 600 mL what is the molarity?

Answer and explanation

Correct answer: 2.0 M

For mixing the same solute, add the moles contributed by each solution and divide by the stated final volume. First solution: n = 3 × 0.200 = 0.600 mol. Second solution: n = 1.5 × 0.400 = 0.600 mol. Total moles = 1.200 mol; final volume = 600 mL = 0.600 L. Therefore M = 1.200/0.600 = 2.0 M, so option B is correct. Options based on averaging concentrations without volume weighting are incorrect.

Related tags

Mixing SolutionsMolarityStoichiometryVolume CalculationMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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