For the reaction
$C u {S O}_{4} \cdot 5 H_{2} O_{(s)} ⇌ {C u S O}_{4} \cdot {3 H}_{2} O_{(s)} + {2 H}_{2} O_{(g)}$
which one is correct representation :-
(1) $K_{p} = {(P_{(H_{2} O)})}^{2}$
(2) $K_{c} = {(H_{2} O)}^{2}$
(3) $K_{p} = K_{c} {(R T)}^{2}$
(4) All

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Solution

The correct option 1.
Salt is one that loses water to the atmosphere. This will occur if the water vapour pressure in equilibrium with the salt is greater than the water vapour
the pressure in the atmosphere. The mechanism by which $c u s o_{4}$ . $5 H_{2} O$ could be efflorescent is that the salt would lose 2 molecules of water and simultaneously from 1 formula unit of $c u s o_{4}$ . $3 H_{2} O$ for each unit of the original salt that dissociates. The above equilibrium equation would apply since all three components would be present.
since $c u s o_{4}$
$5 H_{2} O$ and $c u s o_{4}$ . $3 H_{2} O$ are both solids.
$K_{p}$ = $p (H_{2} O)$
$1.086 \times 10^{4}$

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