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

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

Grade:upto college level

2 Answers

Tanu
22 Points
6 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
askIITians Faculty 646 Points
3 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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