Equilibrium 4

Question 1

explain common ion effect

Answer 1

Let us consider a weak electrolyte ab which dissociates as follows
AB aq <-> A+ aq + B- aq
suppose we are another electrolyte to this electrolyte having common ion A+ or B-
Now the concentration of A+ or B- on the product side will increase due to increase in concentration of a plus or B - ions.
- according to Le Chatlier’s principal, the system tries to decrease the concentration on the product side by shifting equilibrium to the left thus ab is produced by which in turn means the dissociation of ab is suppressed. This effect is called a common ion effect.

Question 2

define common ion effect

Answer 2

Common ion effect is defined as the suppression of change in the value of equilibrium constant on adding an electrolyte halving at least one common ion.

Question 3

Application of common ion effect

Answer 3

Used to suppress acid strength of acid

Question 4

Buffer solution

Answer 4

solutions which maintain a constant ph and whose ph is not altered by addition of small amounts of acids and base.
Eg: - Blood is a natural buffer

Question 5

Characteristics of Buffer solution

Answer 5

• pH do not change.
• Does not change on standing for long time - prepared by mixing weak acid with its salt from a strong base
• Mixing a weak base with the salt from strong acid

Question 6

Define solubility

Answer 6

then a given amount of salute is added to a specified amount of solvent at a given temperature is called a solubility of the salt.