**Question:**

During an experiment the students were asked to prepare a $10 \%$ (Mass/Mass) solution of sugar in water. Ramesh dissolved $10 \mathrm{~g}$ of sugar in $100 \mathrm{~g}$ of water while Sarika prepared it by dissolving $10 \mathrm{~g}$ of sugar in water to make $100 \mathrm{~g}$ of the solution.

(a) Are the two solutions of the same concentration

(b) Compare the mass $\%$ of the two solutions.

**Solution:**

(a) No, the two solutions have different concentrations.

(b) Mass $\%$ of solution prepared by Ramesh $=\frac{\text { Mass of sugar }}{\text { Mass of solution }} \times 100$

$=\frac{10}{(10+100)} \times 100=\frac{10}{110} \times 100=9.09 \%$

Mass $\%$ of solution prepared by Sarika $=\frac{\text { Mass of sugar }}{\text { Mass of solution }} \times 100=\frac{10}{100} \times 100=10.0 \%$