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8 g sodium hydroxide is dissolved in water and final volume is made 200 mL. What is the molarity of the solution?

Answer and explanation

Correct answer: 1.00 M

Molarity is defined as moles of solute per litre of final solution. Sodium hydroxide has molar mass 40 g mol−1, so 8 g contains 8/40 = 0.20 mol. The final volume is 200 mL = 0.200 L. Therefore M = 0.20/0.200 = 1.00 mol L−1, or 1.00 M, so option C is correct. The volume of water before dissolution must not be used; the stated final solution volume is required.

Related tags

Sodium HydroxideMolarityMolar MassSolution VolumeMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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