Question

Potassium iodide is added to freshly precipitated mercury (II) iodide. Which is/are the correct statement/s ? (a) The precipitate will dissolve (b) The solution possesses the anion $\left[\mathrm{Hgl}_{4}\right]^{2-}$ (c) The solution can be used for the test of ammonium ion (d) All the above statements are wrong

Name: Problem 30, Chapter 18: Inorganic Chemistry for Jee mains and Advanced
Uploaded: 2021-08-16T12:13:33-08:00
Duration: 1 min 4 s
Channel: Narayan Hari
Description: Potassium iodide is added to freshly precipitated mercury (II) iodide. Which is/are the correct statement/s ? (a) The precipitate will dissolve (b) The solution possesses the anion [Hgl4]^2- (c) The solution can be used for the test of ammonium ion (d) All the above statements are wrong

   Potassium iodide is added to freshly precipitated mercury (II) iodide. Which is/are the correct statement/s ?
(a) The precipitate will dissolve
(b) The solution possesses the anion $\left[\mathrm{Hgl}_{4}\right]^{2-}$
(c) The solution can be used for the test of ammonium ion
(d) All the above statements are wrong

Inorganic Chemistry for Jee mains and Advanced

Dr OP Tandon 2000 Edition

Chapter 18, Problem 30

Instant Answer

Solved by Expert Narayan Hari

08/16/2021

Step 1

This reaction can be represented as follows: \[ \mathrm{HgI}_{2(s)} + 2\mathrm{KI}_{(aq)} \rightarrow \mathrm{K}_{2}[\mathrm{HgI}_{4}]_{(aq)} \] This shows that the precipitate of mercury (II) iodide will dissolve in the presence of potassium iodide. Show more…

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Potassium iodide is added to freshly precipitated mercury (II) iodide. Which is/are the correct statement/s ? (a) The precipitate will dissolve (b) The solution possesses the anion $\left[\mathrm{Hgl}_{4}\right]^{2-}$ (c) The solution can be used for the test of ammonium ion (d) All the above statements are wrong

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Key Concepts

Complex Ion Formation

This concept deals with how a metal ion can bind to one or more ligands to form a complex ion with distinct properties. When an insoluble compound interacts with an excess of a coordinating ligand, it often converts into a soluble complex ion, thus changing its solubility characteristics.

Solubility Equilibria

Solubility equilibria involve the dynamic balance between a solid phase and its dissolved ions in solution. Modifying the equilibrium, such as through the formation of a soluble complex, can lead to the dissolution of a precipitate that is otherwise insoluble under normal conditions.

Qualitative Analysis

Qualitative analysis employs characteristic reactions, like the formation or dissolution of precipitates and complexes, to detect and confirm the presence of specific ions in a mixture. Understanding how reagents interact to produce observable changes is crucial for designing and interpreting confirmatory tests in inorganic chemistry.

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