Question

Q.1) Which of the following solutions has the highest mass by mass percentage? I. 10 g of sodium chloride in 200 g of water II. 15 g of sugar in 160 g of water III. 60 g of potassium permanganate in 200 g of water IV. 20 g of sodium carbonate in 90 g of water.

I
II
III
IV

Answer 1

Answer:

A solution contains 40 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution.

Answer 2

Answer:

60 g of potassium permanganate in 200 g of water has the highest mass by mass percentage.

Explanation:

Mass by mass percentage $\[=\frac{\text { Mass of solute }}{\text { Mass of solution }} \times 100\]$

The concentration of solution I $\[=\frac{10}{10+200} \times 100=4.76 \%\]$

The concentration of solution II $\[=\frac{15}{160+15} \times 100=8.57 \%\]$

The concentration of solution III $\[=\frac{60}{200+60} \times 100=23.07 \%\]$

The concentration of solution IV$\[=\frac{20}{90+20} \times 100=18.18 \%\]$