Question

6. A student takes some cold water in a beaker and dissolves two tablespoons of salt in it. When the student adds one more tablespoon of salt it gets settled at the bottom of the beaker. The student warms the water and observes that the salt disappears. What can be the reason for this observation?
a) Heat increases the solubility of water
b) Heat evaporates the excess salt in solution
c) After heating the solution become saturated
d) Two table spoon of salt makes the solution unsaturated

Answer 1

The correct option is a) Heat increases the solubility of water.

Explanation:

• In the field of chemistry, saturation point can be described as the point after which no more solute can dissolve in a solvent.
• However, heating the solution increases the solubility of the solvent and the solvent has more tendency to dissolve the solute after heating.
• That is why, the third tablespoon of salt was able to dissolve in water because the solubility was increased by heating.