SATHEE: Qualitative Analysis - Result Question 55

Qualitative Analysis - Result Question 55

####58. An aqueous solution containing one mole of $H g I_{2}$ and two moles of $N a I$ is orange in colour. On addition of excess $N a I$ the solution becomes colourless. The orange colour reappears on subsequent addition of $N a O C l$ . Explain with equations.

(1999, 3M)

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Solution:

$N a I$ on reaction with $H g I_{2}$ gives a complex salt :

$2 N a I + H g I_{2} ⇌ N a_{2} [H g I_{4}]$

The orange colour is due to residual $H g I_{2}$ . On addition of excess $N a I$ , whole $H g I_{2}$ is converted to complex $N a_{2} [H g I_{4}]$ as colour disappear. The orange colour of $H g I_{2}$ reappear due to conversion of $N a_{2} [H g I_{4}]$ into $H g I_{2}$ on treatment with $N a O C l$ .

$\begin{aligned} 3 N a_{2} [H g I_{4}] + 2 N a O C l + 2 H_{2} O ⟶ 3 H g I_{2} & + 2 N a C l & + 4 N a O H + 2 N a I \end{aligned}$

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Qualitative Analysis - Result Question 55

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