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Common Ion Effect

In III group ...

Question

In III group precipitation, $N H_{4} C l$ is added before adding $N H_{4} O H$ to.

Decrease conc. of

O H^{-}

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Prevent interference of

P O_{4}^{3 -}

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Increase conc. of

C l^{-}

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Increase conc. of

O H^{-}

ion.

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Solution

The correct option is A Decrease conc. of $O H^{-}$
The common ion effect is responsible for the reduction in the solubility of an ionic precipitate when a soluble compound containing one of the ions of the precipitate is added to the solution in equilibrium with the precipitate.

Due to Common ion effect, the concentration of ${O H}^{-}$ decreases when $N H_{4} C l$ is added to $N H_{4} O H$

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