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Coordination Complexes

How does K ...

Question

How does $K_{2} [P t {C l}_{4}]$ get ionized when dissolved in water? Will it form precipitate when $A g N O_{3}$ solution is added to it? Give a reason for your answer.

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Solution

$K_{2} [P t {C l}_{4}]$ is a coordination compound with complex ion ${[P t {C l}_{4}]}_{4}^{2 -}$ .
When $K_{2} [P t {C l}_{4}]$ is dissolved in water, the complex ion ${[P t {C l}_{4}]}_{4}^{2 -}$ will retain its identity.
$K_{2} [P t {C l}_{4}] \to 2 K^{+} + {[P t {C l}_{4}]}_{4}^{2 -}$
However when $A g N O_{3}$ is added to $K_{2} [P t {C l}_{4}]$ , grey precipite of $P t {C l}_{2} (A g N O_{3}) (S)$ is obtained.
$K_{2} P t {C l}_{4} + 2 A g N O_{3} \to 2 K C l (a q) + P t {C l}_{2} (A g N O_{3}) (S)$

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