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Mole Concept

When a KI sol...

Question

When a KI solution was added to a solution of mercury (II) chloride, a precipitate mercury (II) iodide formed. A student plotted the mass of the precipitate versus the volume of the KI solution added and obtained the above graph.

As KI is added to ${H g C l}_{2}$ solution, there is increase in the mass of ${H g I}_{2}$ but after a maximum point is reached, mass of ${H g I}_{2}$ decreases. It is due to__________.

Formation of soluble

K_{3} {H g I}_{5}

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Formation of soluble

K_{2} {H g I}_{4}

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Decomposition of

{H g I}_{2}

into

{H g}_{2} I_{2}

and

I_{2}

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Decomposition of

{H g I}_{2}

into

H g

and

I_{2}

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Solution

The correct option is B Formation of soluble $K_{2} {H g I}_{4}$
$H g C l_{2}$ reacts with KI to form $H g I_{2}$ .

$H g C l_{2} + 2 K I \to H g I_{2} + 2 K C l$ .

As the reaction proceeds, more and more of $H g I_{2}$ is obtained until a maximum value is reached.

Then the mass of $H g I_{2}$ decreases due to formation of $K_{2} H g I_{4}$ .

$H g I_{2} + 2 K I \to K_{2} H g I_{4}$

Therefore, option B is correct.

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