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Ammonia

In qualitativ...

Question

In qualitative inorganic analysis of basic radicals, solution is prepared in dil. $H C l$ and then diluted with $H_{2} O$ before $H_{2} S$ gas is passed. Orange turbidity appeared in one case on dilution. Turbidity dissolves when we add $H C l$ .

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Solution

Turbidity dissolves when we add $H C l$ due to formation of antimony trichloride.
$S b O C l + 2 H C l ⟶ S b C l_{3} + H_{2} O$

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