Question

Calculate the volume in milliliters of 25 % (m/v) NaF solution that contains 5.9 g of NaF .Express your answer to two significant figures and include the appropriate units.

Answer 1

The volume is 24mL.

Step-by-step explanation:

The given information from the exercvise is:

- % m/v of the solution: 25

- Mass of solute: 5.9g

To calculate the volume of this solution, we have to replace the values of %m/v and the mass of solute, in the %m/v formula.

The %m/v formula represents the mass (grams) of solute in the volume (milliliters) of the solution, multiplied by 100:

`\begin{gathered} \%\text{m/v}=\frac{\text{ mass of solute \lparen g\rparen}}{\text{ volume of solution \lparen mL\rparen}}*100 \\ 25\%=\frac{5.9g}{\text{ volume of solution \lparen mL\rparen}}*100 \\ 25\%*\text{ volume of solution \lparen mL\rparen=}5.9g*100 \\ 25\%*\text{ volume of solution \lparen mL\rparen=590} \\ \text{ volume of solution \lparen mL\rparen}=(590)/(25) \\ \text{ volume of solution \lparen mL\rparen=23.6} \end{gathered}`

So, the volume is 23.6 milliliters. Rounding to two significant figures the result is 24 mL.