chemistry by tushar sir

class 9, science, types of solution

types of solution

  1. Solid solutions: in which solid is the solvent while solute can be either a solid, liquid or a gas. Such as alloys {jewellery of gold (solid in solid)}, hydrated salts (hydrated copper sulphate), etc.
  2. Liquid solution: in which liquid is the solvent while solute can be solid, liquid or gas. Such as: a solution of sugar in the water(solid in liquid), a solution of alcohol in water(liquid in liquid), aerated drinks(gas in liquid)
  3. Gas solution: in which gas is the solvent while solute can be either a solid, liquid or a gas. Such as: camphor in air, clouds, fog, air, etc.  

 MISCIBLE & NON-MISCIBLITYOF SOLUTION

  • Saturated Solution: A solution in which no more solute can be dissolved at a given temperature is called a saturated solution.
  • Unsaturated solution: A solution in which more solute can be dissolved at a given temperature is called an unsaturated solution.
  • A given solution that is saturated at a particular temperature may become unsaturated when the temperature is increased.

SOLUBILITY

Solubility of solids in liquids: When a saturated solution at a particular temperature (say room temperature) is heated, it becomes unsaturated. This is because the solubility of a substance generally increases with increase in temperature and hence more solute can be dissolved on increasing the temperature. If a saturated solution, at a particular temperature is cooled, then some of the dissolved solute will separate out in form of crystals. This is because solubility of solute in the solution decreases on cooling.

Solubility of gases in liquids: The solubility of gases in liquids increases on decreasing the temperature or decreases on increasing the temperature. For example, water contains dissolved oxygen. When water is boiled, the solubility of oxygen in water decreases and the excess oxygen escapes in form of bubbles.

EFFECT OF PRESSURE ON THE SOLUBILITY

  • An increase in pressure increases the solubility of a gas. Example: aerated water bottles contain carbon dioxide gas under pressure.

EFFECT OF TEMPERATURE ON THE SOLUBILITY

  • Increase in temperature increases the solubility. Example: it is easier to dissolve sugar in hot milk than in cold milk.