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Addition of HgI2 to aq. KI solution shows an increase in the vapour pressure why?

aditya kashyap , 11 Years ago
Grade upto college level
anser 2 Answers
Tanu

Last Activity: 8 Years ago

HgI2 forms a complex with KI and therefore number of particles in the solution decreases.HgI2 + 2KI → K2[HgI4] Vapour pressure is a colligative property, decrease in number of solute particles will increase the vapour pressure. Therefore it will show increase in vapour pressure not decrease.

Rishi Sharma

Last Activity: 4 Years ago

Dear Student,
Please find below the solution to your problem.

KI forms a complex with HgI2​.
2KI+HgI2​⟶K2​HgI4​
Therefore, the number of particles in solution decreases resulting in the decrease in relative lowering of vapour pressure. Hence, vapour pressure increases.

Thanks and Regards

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