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Chemistry - Liquid Solution Question with Solution | TestHub

ChemistryLiquid SolutionAbnormal Colligatiove PropertiesHard2 minPYQ_2021
ChemistryHardnumerical

The boiling point of water in a molal silver nitrate solution (solution ) is . To this solution , an equal volume of molal aqueous barium chloride solution is added to make a new solution B. The difference in the boiling points of water in the two solutions and is .
(Assume: Densities of the solutions and are the same as that of water and the soluble salts dissociate completely.
Use: Molal elevation constant (Ebullioscopic Constant), ; Boiling point of pure water as .)
The value ofyis ___.

Answer:
2.50
Solution:

After addingBaCl2solution inAgNO3solutionAgClwill be precipitate.

Since volume of both solutions are equal let's take

V=1 L of each.

so initial moles of AgNO3=0.1 mole

initial moles of BaCl2=0.1 mole

2 AgNO3+BaCl22AgCl+BaNO32

2AgNO3+BaCl22AgCl+BaNO32Intial moles0.10.1Change0.10.05+0.1+0.05Final moles00.050.05Final concentration0.0520.052

New ΔTb=1 Kb m

3×0.052+3×0.052×0.5=0.075C

Difference in boiling point of both solution

=ΔTb1ΔTb2=0.10.075

=0.025=2.5×102 K

Subject:ChemistryTopic:Liquid SolutionSubtopic:Abnormal Colligatiove Properties
2mℹ️ Source: PYQ_2021

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