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Question

Explain the following giving examples

a.saturated solution

b. Pure substance

c. Colloid

d. Suspension


Solution

Dear student,

a)  Saturated Solution A solution in which no more solute can be dissolved at any fixed temperature is called a saturated solution. In a saturated solution, dissolved and undissolved solutes are in equilibrium with each other. Any more solute added will settle down at the bottom of the container as a precipitate.

E.g. If 500 g of a solvent can dissolve a maximum of 150 g of a particular solute at 300 K. Then, the solution obtained by dissolving 150 g of that solute in 500 g of that solvent at 300 K is said to be a saturated solution at 300 K.

b). A pure substance is one which is made up of only one kind of particles. It cannot be separated into different constituents by physical or chemical processes. Some examples of pure substances are bromine, nitric acid, calcium oxide, etc.

c)Colloid
  • a colloid is a mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance. Sometimes the dispersed substance alone is called the colloid; the term colloidal suspension refers unambiguously to the overall mixture.
  • The particles of a colloid are very small and cannot be seen with the naked eye.
  • The particles in a colloid do not settle down when left undisturbed. This shows the stable nature of the colloid.

Example of colloids:
milk, blood, toothpaste, jelly, fog, cloud, etc.

d)   A suspension is a heterogeneous mixture.

  • The particles of a suspension are quite large,it is about 10 -7m and they scatter a beam of light passing through the suspension and make its path visible.
  • A suspension is unstable. When a suspension is left undisturbed, its solute particles settle down at the bottom of the container.
  • Ex: A suspension of soil, chalk powder in water.

Regards

Chemistry

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