What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?

M g C O_{3}, H_{2} O, C O_{2}

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M g (H C O_{3})_{2}, H_{2} O

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M g (O H)_{2}, H_{2} O

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M g (O H)_{2}, C O_{2}

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Solution

The correct option is A $M g C O_{3}, H_{2} O, C O_{2}$
Aqueous solution of magnesium bicarbonate on boiling gives $M g C O_{3} + C O_{2} + H_{2} O$
$M g (H C O 3)_{2} \to M g C O_{3} + C O_{2} + H_{2} O$ (upon heating)
Temporary hardness of water is due to presence of bicarbonates of Ca and Mg. It is possible to remove temporary hardness by boiling water. Upon boiling, the soluble bicarbonates are decomposed to insoluble carbonates, which can be filtered off.
Hence option A is correct option.

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