Ways of Representing Concentration

Q.

2 litres of alcohol is present in 8 litres of an aqueous solution of alcohol. The volume percent will be?

1. 20%

2. 22.5 %

3. 25 %

4. 27.5%

Q.

Which among the following formulae can be used for calculating the concentration?

(i) $\frac{\text{mass of solute}}{\text{mass of solution}}\times 100$

(ii) $\frac{\text{mass of solute}}{\text{mass of solute + solvent}}\times 100$

(iii) $\frac{\text{mass of solvent}}{\text{mass of solution}}\times 100$

(iv) $\frac{\text{mass of solvent}}{\text{mass of solute + solvent}}\times 100$

(v) $\frac{\text{mass of solute}}{\text{volume of solution}}\times 100$

(vi) $\frac{\text{mass of solvent}}{\text{volume of solution}}\times 100$

1. (i), (ii), (vi)

2. (iv), (iii), (vi)

3. (iv), (iii), (v)

4. (i), (ii), (v)