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Preparations and Uses of Sodium Carbonate

The hydrolysi...

Question

The hydrolysis of sodium carbonate involves the reaction between:

N a^{+}

and water

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N a^{+}

and

O H^{-}

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C O_{3}^{2 -}

and water

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C O_{3}^{2 -}

and

H^{+}

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Solution

The correct option is C $C O_{3}^{2 -}$ and water
It is soluble in water with evolution of considerable amount of heat.
$N a_{2} C O_{3} + 2 H_{2} O ⇌ 2 N a O H + H_{2} C O_{3}$
or $2 N a^{+} + C O_{3}^{2 -} + 2 H_{2} O ⇌ 2 N a^{+} + 2 O H^{-} + H_{2} C O_{3}$
It is anionic hydrolysis.
The solution is alkaline in nature due to hydrolysis.

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H C O_{3}^{-} (a q .) + O H^{-} (a q .) \to C O_{3}^{2} (a q .) + H_{2} O

N a H C O_{3}

H^{+}

O H^{-} i o n

H C O_{3}^{-} + H_{2} O i o n i z a t i o n ⇋ C O_{3}^{2 -} + H_{2} O

H C O_{3}^{-} + H_{2} O i o n i z a t i o n ⇋ H_{2} C O_{3} + O H^{-}

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