Question

1.Why mixture of stone pebbles and water is considered a suspension? Write few properties of the suspension. How suspension differs from the colloidal solution?
2.Solubility of salt at 20oC is 30. What does it mean? What happens if the temperature of a saturated solution is increased and decreased? Explain in details.​

Answer 1

Explanation:

1.A mixture of stone, pebbles, and water is an example of a suspension. Because the particle size is more than 1000nm.

Properties of suspensions:

Suspension is a heterogeneous mixture. The constituents of the mixture are clearly visible.

The particle size will be more than 1000nm. If the suspension is left undisturbed then the particles will settle down.

Properties of Colloids:

Whereas in colloidal solutions, the particle size is in between 1nm-1000nm.

The particles will never settle down in colloid.

They show the Tyndall effect.

2.The solubility of salt at 20^oC is 30. That means the maximum amount of salt that is present in 100 g of water is 30 g.

If the temperature of a saturated solution is increased then, its solubility increases or decreases based on the nature of the solute.

For example if we take sodium chloride salt ,then its solubility is not effected by the change in temperature.

For cerium sulphate salt if temperature increases, then its solubility in water  decreases.

For sugar (sucrose) its solubility increases with increase in temperature.