The solubility (S) of a solute in water varies with temperature as given by S = A e - Δ H / R T , Δ H being the enthalpy of solution. For a given solute, variation of lnS with temperature is as shown in figure. The solute is expected to be

Question

The solubility (S) of a solute in water varies with temperature as given by S = A e - Δ H / R T , Δ H being the enthalpy of solution. For a given solute, variation of lnS with temperature is as shown in figure. The solute is expected to be, CaO, M g S O 4, C u S O 4, C u S O 4 . 5 H 2 O

MARKS App · Accepted Answer

lnS = lnA − ΔH RT Slope = − ΔH RT lnS vs 1 T graph with negative slope. So, Δ H > 0 Salts with water of crystallisation. i.e., C u S O 4 . 5 H 2 O .

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