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113
5.
Ans.
Write any four applications of osmosis in day to day life.
(a) A raw mango kept in a concentrated salt solution loses water due to osmosis and shrivel
(shrinks and wrinkles) into pickle.
(b) A limp carrot can be placed in water making it firm once again. Water moves in carrot
due to osmosis.
(c) Blood cells placed in water containing less than 0.91% salt collapse due to loss of water
by osmosis.
(d) People eating lot of salt experience edema i.e. swelling of tissue cells due to water retention.
(e) The fruits can be preserved by adding sugar. Since bacterium cell loses water due to osmosis,
shrivels and dies.
(f) In plants the leaves loose water by transpiration. The solute concentration in leaf therefore,
increases. Due to osmosis water is pulled from soil and transported in upward direction.
*6.
Ans.
State van’t Hoff’s-Boyle’s law.
Boyle Van’t Hoff law : It states that “Temperature remaining constant, the osmotic pressure
of a dilute solution is directly proportional to the molar concentration of the solution or inversely
proportional to the volume of the solution.”
If π represents the osmotic pressure (in atmospheres) and C is the molar concentration in
moles/litre, we have
π∝C
at constant temperature
If n moles of the substance are dissolved in V litres of the solution.
n
1
C∝
i.e.
C=
V
V
The above results may, therefore, be written as
1
π∝
(at constant temperature)
V
or πV = constant
(at constant temperature)
*7.
Ans.
State van’t Hoff-Charles law.
van’t Hoff Charle’s law : Similar to Charles law for gases, it state that ‘for a given concentration
of a solution, the osmotic pressure is directly proportional to the absolute temperature’.
Mathematically, π ∝ T
(for a given concentration)
π
= constant
T
*8.
Ans.
(for a given concentration)
State van’t Hoff Avogadro’s law.
Statement : This law states that, Equal volumes of isotonic solutions at the same temperature
contain equal number of moles of solute.
Van’t Hoff equation for two different dilute solutions can be written as follows:
Chapter - 2 Solutions and Colligative Properties
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