Question

10 g of $BaC{l}_2$ is dissolved in 90 g of water. The density of the solution is 1.09 g/mL. Calculate the % (w/v) concentration of the solution.

• A. 10.90%
• B. 9.17%
• C. 1.09%
• D. 0.91%

Answer 1

The correct option is A 10.90%

$\text{Mass of the solution}=10g+90g=100g$
We know that:
$Density=\frac{Mass}{Volume}$

$Volume=\frac{Mass}{Density}$

$Volume=\frac{100g}{1.09g/mL}=91.74mL$

$\%\left(w/v\right)=\frac{\text{mass of the solute in g}}{\text{volume of the solution in mL}}\times 100=\frac{10}{91.74}\times 100=10.90\%$