Under what pressure conditions be efflorescent at 25°C

CHEMISTRY · Subjective · A Level · Chemistry · Gaseous equilibria (Kp) · Gaseous equilibria (Kp)

Problem

Under what pressure conditions CuSO4⋅5H2O\text{CuSO}_4 \cdot 5\text{H}_2\text{O} be efflorescent at 25°C? How good a drying agent is CuSO4⋅3H2O\text{CuSO}_4 \cdot 3\text{H}_2\text{O} at the same temperature? Given CuSO4⋅5H2O(s)⇌CuSO4⋅3H2O(s)+2H2O(v)\text{CuSO}_4 \cdot 5\text{H}_2\text{O}(s) \rightleftharpoons \text{CuSO}_4 \cdot 3\text{H}_2\text{O}(s) + 2\text{H}_2\text{O}(v) KP=1.086×10−4K_P = 1.086 \times 10^{-4} atm 2^2 at 25°C. Vapour pressure of water at 25°C is 23.8 mm of Hg.

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