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lys-0071 [83]
3 years ago
15

Which of the following solutes will lower the freezing point of water the most?

Chemistry
2 answers:
Dennis_Churaev [7]3 years ago
5 0

Answer: the ionic compound calcium fluoride (CaF_2)

Explanation:

\Delta T_f=i\times k_f\times m

T_f = change in freezing point

i = Van'T Hoff factor

k_f = freezing point constant

m = molality

1. For C_{12}H_{22}O_{11} , i= 1 as it is a non electrolyte and does not dissociate.

2. For MgSO_{4} , i= 2 as it is a electrolyte and dissociate to give 2 ions.

MgSO_4\rightarrow Mg^{2+}+SO_4^{2-}

3. For LiCl, i= 2 as it is a electrolyte and dissociate to give 2 ions.

LiCl\rightarrow Li^{+}+Cl^{-}

4. For CaF_{2}, i= 3 as it is a electrolyte and dissociate to give 3 ions.

CaF_2\rightarrow Ca^{2+}+2F^{-}

Thus as vant hoff factor is highest factor for CaF_{2} and the freezing point will be lowest.

Lapatulllka [165]3 years ago
4 0
Freezing point depression is directly proportional to molality. So the compound to have the greatest effect will be the one that disassociates into the most ions = CaF2
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