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Temporary Hardness and Removal

The temporary...

Question

The temporary hardness of a water sample is due to compound $X$ . Boiling this sample converts $X$ to compound $Y$ . $X$ and $Y$ respectively are:

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

and

M g (O H)_{2}

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C a (H C O_{3})_{2}

and

C a (O H)_{2}

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

and

M g C O_{3}

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C a (H C O_{3})_{2}

and

C a O

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Solution

The correct option is A $M g (H C O_{3})_{2}$ and $M g (O H)_{2}$
Temporary hardness of water is due to $M g (H C O_{3})_{2}$ and $C a (H C O_{3})_{2}$ . During boiling, the soluble $M g (H C O_{3})_{2}$ is converted to insoluble $M g (O H)_{2}$ and $C a (H C O_{3})_{2}$ is converted to insoluble $C a C O_{3}$ . These precipitates can be removed by filtration. Filtrate thus obtained will be soft water.
$M g (H C O_{3})_{2} h e a t i n g - --- \to M g (O H)_{2} ↓ + 2 C O_{2} ↑$
$C a (H C O_{3})_{2} h e a t i n g - --- \to C a C O_{3} ↓ + H_{2} O + 2 C O_{2} ↑$

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