Answer:
Henry's law states that the solubility of a
gas in a liquid is directly proportional to the pressure of the gas. Further
mole fraction of the gas in a solution is proportional to the partial pressure
of the gas.
Partial
pressure of the gas in solution
= KH x mole fraction of gas in
solution
or 
where KH is Henry's law
constant.
(i) To increase the solubility of CO2
in soft drinks and soda water, the bottle is sealed under high pressure.
(ii) At high altitudes, the partial
pressure of oxygen is less than that at the ground level because the atmospheric
pressure is less. Low blood oxygen causes anoxia.
(iii)
To avoid bends (painful effects during the decompression of scuba divers),
oxygen diluted with less soluble helium gas is used by the sea divers.
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