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Mixture

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Question

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A cylinder fitted with a movable piston contains liquid water in equilibrium with water vapour 25 $°$ C. Which operation result in a decrease in the equilibrium vapour pressure ?

(1) Moving the piston downward a short distance
(2) Removing a small amount of vapour
(3) Removing a small amount of the liquid water
(4) Dissolving salt in the water

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Solution

Dear Student ,
Answer is 4 .
On dissolving salt in the water as increasing the concentration of a solution forward reaction decreases and hence results in decrease in the equilibrium vapour pressure .
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