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stefanylopez731
07.12.2019 •
Chemistry
When hno2 is dissolved in water it partially dissociates according to the equation hno2⇌h++no−2. a solution is prepared that contains 4.000 g of hno2 in 1.000 kg of water. its freezing point is found to be -0.1692 ∘c calculate the fraction of hno2 that has dissociated.
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Ответ:
The degree of dissociation is 1
thus the fraction dissociated is one
Explanation:
The depression in freezing point is a colligative property and depends upon the number of solute particles present in the solution.
The relation between depression in freezing point and molality is:
For water
Kf=1.86 °C/m
Where
i= Van't Hoff factor
For electrolytes the i depends upon on the extent of dissociation
i = αn + (1 - α)
Where
α = is degree of dissociation
Let us put the values
Putting value:
Ответ: