What is the molarity of a solution prepared by dissolving 4.0 g of NaOH in enough water to form 250 mL of solution?

Model Answer & Options

Source: Extra Practice

0.1 M

0.4 M

1.0 M

0.25 M

Explanation

Molarity (M) = Moles of solute / Volume of solution in Liters. Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol. Moles of NaOH = 4.0 / 40 = 0.1 mol. Volume = 250 mL = 0.250 L. Molarity = 0.1 / 0.250 = 0.4 M. Option 0.1 M is the number of moles, not molarity. 1.0 M and 0.25 M are incorrect calculations.

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