Question

A solution contains 50 g of common salt in 400 g of water. The concentration by mass percentage of the solution is ________.

[1 Mark]

Answer 1

Mass of solute= 50g

Mass of solvent = 400g

Mass of solution = mass of solute + mass of solvent

$=50+400$

$=450g$

Mass percentage of solution $=\frac{\text{mass of solute}}{\text{mass of solution}}\times 100=\frac{50}{450}\times 100=11.11\%$.

[1 Mark]