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Answer the following in one or two sentences. Which of the following solution will have higher freezing point depression and why? i. 0.1 m NaCl ii. 0.05 m Al2(SO4)3 - Chemistry

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Short Note

Answer the following in one or two sentences.

Which of the following solution will have higher freezing point depression and why?

i. 0.1 m NaCl

ii. 0.05 m Al2(SO4)3

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Solution

For 0.1 m NaCl:

NaCl   →   Na+     +    Cl-

0.1 m       0.1 m         0.1 m 

Total particles in solution = 0.2 mol

For 0.05 m Al2(SO4)3:

Al2(SO4)3    →  2Al3+     + 3`"SO"_4^(2-)`

0.05 m             0.1 m            0.15 m

Total particles in solution = 0.25 mol

Al2(SO4)3 solution contains more number of particles than NaCl solution. Hence, Al2(SO4)3 solution has maximum ΔTf.

Therefore, the freezing point depression of 0.05 m Al2(SO4)3 solution will be higher than 0.1 m NaCl solution.

Concept: Colligative Properties of Electrolytes
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APPEARS IN

Balbharati Chemistry 12th Standard HSC for Maharashtra State Board
Chapter 2 Solutions
Exercises | Q 2.07 | Page 45
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