(a) To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find the concentration at this temperature.
(b) What is the effect of temperature on the solubility of a solid in a liquid ?
(c ) Why is it possible to distinguish the particles of a solute from those of a solvent in a suspension ?

Explanation

(a) Mass of solute = 36 g
Mass = solution = (36 + 100) = 136 g
Concentration of solution = `((36 g))/((136g)) xx 100` = 26.4%
(b) Solubility of a solid in a liquid is generally directly proportional to the temperature. If the temperature increases, the solubility increases. If the temperature decreases, so is the solubility. However, there are some exceptions also. Solubility of lithium carbonate in water decrease with increase in temperature.
(c ) In a suspension, the size of the particles of the particles of the dispersed phase is quite big. They can be easily distinguished from the particles of the dispersion medium. They can be seen even with naked eye.