Discussion
Which of the following are correct ?
(I) Henry's law is applicable for the dissolution of O2 in water.
(II) Henry's law is applicable for the dissolution of HCl in water.
(III) Dissolution of gases in liquids increases with pressure.
(IV) Unit of Henry's law constant is atm-1.
Answer: B
Statements (I) and (III) are correct, so the answer is (I), (III).
Henry's law, which states that the solubility of a gas is proportional to its partial pressure, holds for gases that dissolve without reacting with the solvent, such as O2 in water (I), and it implies that solubility increases with pressure (III).
HCl does not obey Henry's law in water because it ionises completely to H3O+ and Cl-, so (II) is false. The unit in (IV) is also wrong for the usual form p = KHx, where KH has units of pressure (atm or bar), not atm-1; the constant's unit depends on how the law is written, so atm-1 is not 'the' unit.
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