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LuckyWell [14K]
3 years ago
9

Which has the lowest freezing point?

Chemistry
2 answers:
Likurg_2 [28]3 years ago
5 0

Answer: 0.5 M ionic AlCl_3

Explanation: Addition of nonvolatile solute depresses the freezing point of a solvent. As depression in freezing point is a colligative property, which means it depends on the amount of solute. Thus more is the no of ions, more is the depression in freezing point.

\Delta T=k_f\times m

\Delta T=Depression in freezing point

k_f= freezing point constant

m= molality

a) pure water: It is a pure solvent and freezes at 0 ° C.

b) 0.5M ionic NaCl:

NaCl\rightarrow Na^++Cl^-, it produces two ions, each of concentration 0.5M. The total concentration of ions is 1.0 M.

c) 0.5 M ionic CaCl_2

CaCl_2\rightarrow Ca^{2+}+2Cl^-, it produces two ions, Ca^{2+} of concentration 0.5M and Cl^- of concentration 2\times 0.5 M=1.0 M. The total concentration of ions is 1.5 M.

d) 0.5 M ionic AlCl_3

AlCl_3\rightarrow Al^{3+}+3Cl^-, it produces two ions, Al^{3+} of concentration 0.5 M and Cl^- of concentration 3\times 0.5 M=1.5 MThe total concentration of ions is 2.0 M.

e) 0.5 M molecular C_{12}H_{22}O_{11}

It is a covalent compound and do not dissociate into ions. thus the concentration will be 0.5 M only.

As the concentration of ions is highest in 0.5 M ionic AlCl_3, the depression in freezing point is highest ans thus it has lowest freezing point.


valkas [14]3 years ago
4 0
E has indeed the lowest freezing point.
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