Chapter 25, Problem 107A

Interpretation Introduction

Interpretation: The question is to find the volume (in mL) that must be measured to give 0.0020 mol of sodium sulfate.

Concept Introduction: Use the concentration formula to find the volume of sodium sulfate.

  $\text{Concentration }=\frac{\text{ Moles of solute }}{\text{ Volume of solution }}$

Answer to Problem 107A

The volume that must be measured to give 0.0020 mol of sodium sulfate is 6.7 mL.

Explanation of Solution

Given information:

The concentration of sodium sulfate solution is 0.30 M.

The number of moles of sodium sulfate is 0.0020 mol.

Using the concentration formula and substituting the given values,

  $\begin{array}{c}\text{Concentration }=\frac{\text{ Moles of solute }}{\text{ Volume of solution }}\\ 0.30M/L=\frac{0.0020\text{ mol}}{Volume}\\ Volume=\frac{0.0020}{0.30}\\ \approx 0.0067L\\ \approx 6.7mL\end{array}$

Conclusion

Hence, the volume that must be measured to give 0.0020 mol of sodium sulfate is 6.7 mL.