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Solubility Product

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Addition of ${N H}_{4} C l$ to a solution containing ferric and magnesium ions is essential for selective precipitation or ferric hydroxide by aqueous ammonia.

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Addition of ${N H}_{4} C l$ to a solution containing ferric and magnesium ions is essential for selective precipitation or ferric hydroxide by aqueous ammonia. Ammonium chloride suppress the ionisation of ammonium hydroxide so that only the group III radicals are precipitated because the solubility produict of group III hydroxides is less than that of group IV and group VI hydroxides.

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Q. Assertion :Addition of ammonium chloride to a solution containing ferric and magnesium ions is essential for selective precipitation of ferric hydroxide by aqueous ammonia. Reason: The function of

N H_{4} C l

is to supress the ionization of

N H_{4} O H

by common ion effect and thus prevents the precipitation of

M g (O H)_{2}

K_{s p} o f M g (O H)_{2}

Statement: The aqueous solution of triethylamine precipitates iron as ferric hydroxide when added to the ferric chloride solution.

State whether the given statement is true or false.

M g^{2 +}

ions is essential for selective precipitation of

F e (O H)_{3}

N H_{3}

.

State whether the given statement is true or false.

Q. On adding few drops of dilute

H C l

F e C l_{3}

to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. This phenomenon is known as :

Q. Differentiate between:
(i) Action on indicators or dry ammonia gas and aqueous ammonia.
(ii) Reaction of excess ammonia with chlorine and NH₃ with excess chlorine.
(iii) Aqueous ferrous and ferric sulphate solution.

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