Which aqueous solution has the lowest freezin | vedclass

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Question

(A) The depression in freezing point $\Delta T_f$ is directly proportional to the van't Hoff factor $(i)$ and molar concentration $(C)$,i.e.,$\Delta T

Vedclass · Accepted Answer

$0.01 \, M \ NaCl$

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(A) The depression in freezing point $\Delta T_f$ is directly proportional to the van't Hoff factor $(i)$ and molar concentration $(C)$,i.e.,$\Delta T_f \propto C 	imes i$. For $0.01 \, M \ NaCl$: $C 	imes i = 0.01 	imes 2 = 0.020$. For $0.005 \, M \ C_2H_5OH$: $C 	imes i = 0.005 	imes 1 = 0.005$. For $0.005 \, M \ MgI_2$: $C 	imes i = 0.005 	imes 3 = 0.015$. For $0.005 \, M \ MgSO_4$: $C 	imes i = 0.005 	imes 2 = 0.010$. Since the product $C 	imes i$ is highest for $0.01 \, M \ NaCl$,it will show the maximum depression in freezing point,resulting in the lowest freezing point.

Which aqueous solution has the lowest freezing point?

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