Chapter 8, Problem 8.70P

Interpretation Introduction

(a)

Interpretation:

The weight/volume percent composition of a solution that contains $\text{5}\text{.5 g}$ of $\text{LiCl}$ in $550\text{ mL}$ is to be calculated.

Concept introduction:

Several concentration units may be used to express the concentration. It is often useful to express the concentration in terms of percentage. This can be expressed as the amount of solute in grams dissolved in $100\text{ mL}$ of solution that is termed as weight by volume percentage. The other way is to express the number of milliliters of solute per $100\text{ mL}$ of the solution.

The formula to calculate the weight/volume percent is as follows:

  $\text{Weight/volume percent}\left(\frac{\text{m}}{\text{v}}\right)\%=\frac{\text{Mass of solute}\left(\text{g}\right)}{\text{Volume of solution}\left(\text{mL}\right)}\times 100\%$

Interpretation Introduction

(b)

Interpretation:

The weight/volume percent concentration of a solution that contains $\text{12}\text{.5 g}$ of ${\text{NaNO}}_3$ in $250\text{ mL}$ is to be calculated.

Concept introduction:

Several concentration units may be used to express the concentration. It is often useful to express the concentration in terms of percentage. This can be expressed as the amount of solute in grams dissolved in $100\text{ mL}$ of solution that is termed as weight by volume percentage. The other way is to express as number of milliliters of solute per $100\text{ mL}$ of the solution.

The formula to calculate the weight/volume percent is as follows:

  $\text{Weight/volume percent}\left(\frac{\text{m}}{\text{v}}\right)\%=\frac{\text{Mass of solute}\left(\text{g}\right)}{\text{Volume of solution}\left(\text{mL}\right)}\times 100\%$

Interpretation Introduction

(c)

Interpretation:

The weight/volume percent composition of a solution that contains $20\text{ g}$ of $\text{NaOH}$ in $\text{400 mL}$ is to be calculated.

Concept introduction:

Several concentration units may be used to express the concentration. It is often useful to express the concentration in terms of percentage. This can be expressed as the amount of solute in grams dissolved in $100\text{ mL}$ of solution that is termed as weight by volume percentage. The other way is to express as the number of milliliters of solute per $100\text{ mL}$ of the solution.

The formula to calculate the weight/volume percent is as follows:

  $\text{Weight/volume percent}\left(\frac{\text{m}}{\text{v}}\right)\%=\frac{\text{Mass of solute}\left(\text{g}\right)}{\text{Volume of solution}\left(\text{mL}\right)}\times 100\%$