An aqueous solution is prepared by dissolving 8.00 g of sodium hydroxide (NaOH) in 200.0 mL of water at 298 K. Calculate the molarity of the solution.

Step-by-step solution

1. Convert the mass of NaOH to moles: $n=\frac{8.00,\text{g}}{40.00,{\text{g mol}}^{-1}}=0.200,\text{mol}$.
2. Convert the volume of the solution to litres: $V=200.0,\text{mL}=0.200,\text{L}$.
3. Compute molarity: $M=\frac{n}{V}=\frac{0.200,\text{mol}}{0.200,\text{L}}=1.0,{\text{mol L}}^{-1}$.

Concept tested: Molarity calculation

Published 12 September 2026 · Last updated 16 September 2026 · How this solution was prepared and checked