A certain salt has a negative Enthalpy of Solution (i.e. H soln = –), and a posi
ID: 925357 • Letter: A
Question
A certain salt has a negative Enthalpy of Solution (i.e. Hsoln = –), and a positive Entropy of Solution (Ssoln = +). Upon increasing the temperature of the water solvent, you would expect:
The solubility of the salt to increase
The solubility of the salt to decrease
The solubility to remain unchanged, as Hsoln & Ssoln have opposite signs
The effect on the solubility cannot be determined
AThe solubility of the salt to increase
BThe solubility of the salt to decrease
CThe solubility to remain unchanged, as Hsoln & Ssoln have opposite signs
DThe effect on the solubility cannot be determined
Explanation / Answer
We know that G = H - TS
Given H = -ve : S = +ve and also T = +ve
So G = H - TS
G = -ve - (+ve * +ve )
= -ve - (+ve)
= -ve
So G = -ve
When G = negative the reaction is spontaneous reaction .
Therefore The solubility of the salt to increase.
So option (A) is correct
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