Question

The concentration of solutions is sometimes expressed in terms of percentage of mass or volume precent in total mass or volume of the solution. When nothing is mentioned, it satnds for
A. mass percent
B. volume percent
C. mass by volume percent
D. volume by mass percent

Answer 1

Correct Answer - 1
In case of a solid dissolved in a liquid, the percentage by mass means the mass of the solute in grams present in 100 g of the solution, i.e., it is `weight//weight (w//w)` and percentage by volume means the mass of the solute dissolved in `100 mL` or `100 cm^(3)` of the solution i.e., it is `weight//volume (w//v)`.
In case of a liquid dissolved in another liquid, percentage by mass has the same meaning but percentage by volume means the volume of the liquid solute in `cm^(3)` present in `100 cm^(3)` of the solution, i.e., it is `volume//volume (w//v)`.