Question

Why is freezing point depression of 0.1m nacl solution nearly twice that of 0.1m glucose solution?

Answer 1

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Answer 2

Answer: Freezing point depression of 0.1m nacl solution nearly twice that of 0.1m glucose solution because NaCl is a strong electrolyte and it dissociates to give two ions $Na^+$ and $Cl^{-}$, whereas glucose $(C_6H_{12}O_6)$ is a non electrolyte and it does not dissociate to give ions.

Depression in freezing point :

Formula used for lowering in freezing point is,

$\Delta T_f=i\times k_f\times m$

where,

$T_f$ = change in freezing point

i= vant hoff factor

$k_f$ = freezing point constant

m = molality

for complete dissociation of NaCl, i=2 whereas for glucose i=1.