What is meant by the concentration of a solution?

Classify the following into solution, suspensions and colloids:

Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.

Define the following:

(a) Sol

(b) Aerosol

(c) Emulsion

(d) foam

What will happen if a saturated solution is : (i) heated, and (ii) cooled?

21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride at that temperature.