Depression in freezing point of 0.01 molal solution of HF is -0.201℃. Calculate the percentage degree of dissociation of HF.
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12th
Chemistry
Solutions
Colligative Properties and Determination of Molar Mass
In a 0.2 molal aqueous solu...
CHEMISTRY
In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionization is 0.3. Taking K
f
for water as 1.85, the freezing point of the solution will be nearest to:
December 20, 2019avatar
Adwitiyaa Mamdapur
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ΔT=K
f
×molality×(1+α)(HX⇌H
+
+X
−
)
Given molality = 0.2; degree of ionization is 0.3
=1.85×0.2×(1+0.3)
=0.481K
The freezing point of the solution will be 0.81 k.
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