A solution is prepared by dissolving 3.50 g of sodium chloride (NaCl) in 200.0 mL of water. Calculate the molarity of the resulting solution.

Step-by-step solution

1. Determine the molar mass of NaCl: $58.44\mathrm{gmo}{\mathrm{l}}^{-1}$.
2. Calculate the number of moles of NaCl: $\frac{3.50\mathrm{g}}{58.44\mathrm{gmo}{\mathrm{l}}^{-1}}=0.0599\mathrm{mol}$.
3. Convert the volume of the solution to litres: $200.0\mathrm{mL}=0.200\mathrm{L}$.
4. Compute the molarity: $\frac{0.0599\mathrm{mol}}{0.200\mathrm{L}}=0.2995\mathrm{M}$.
5. Round to three significant figures: $0.300\mathrm{M}$.

Concept tested: Molarity of a solution

Published 10 September 2026 · Last updated 16 September 2026 · How this solution was prepared and checked