Chapter 4, Problem 20E

Interpretation Introduction

Interpretation: The molarity of ethanol in the solution prepared by dissolving $\text{75}\text{.0}\text{mL}$ of ethanol in enough water to make $\text{250}\text{.0}\text{mL}$ of the solution is to be calculated.

Concept introduction: The solute’s amount is one major factor affecting the solution’s concentration. Any solution always contains a definite solute and solvent’s amount. The solute’s amount in terms of its mass is computed using its density and volume. This mass further gives its moles. The expression for molarity is shown below.

  $\text{Molarity}=\frac{\text{Number of moles of solute}}{\text{Volume of solution}}$