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lutik1710 [3]
3 years ago
8

What is the freezing point of a 0.82 m aqueous solution of a non-volatile non-electrolyte?

Chemistry
1 answer:
Hoochie [10]3 years ago
6 0

Answer:

-1.5 °C

Explanation:

The freezing-point depression is a colligative property, that is, the property of a solution. The freezing point of a solution is lower than the freezing point of the pure solvent. We can find the freezing-point depression of a solution of <em>a non-volatile non-electrolyte solute</em> using the following expression.

\Delta T_f = K_f \times b

where,

  • \Delta T_f: the freezing-point depression
  • K_f:  cryoscopic constant (For water, Kf = 1.86 °C/m)
  • b: molality

\Delta T_f = \frac{1.86\°C}{m}  \times 0.82m = 1.5\°C

The freezing-point of pure water is 0°C. The freezing-point of the solution is:

0\°C-1.5\°C = -1.5\°C

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