Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

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Solution

The presence of magnesium and calcium bi-carbonates in water makes it temporarily hard. In this case, the hardness in water can be removed to a large extent by boiling the water.

When we boil water the soluble salts of $M g (H C O_{3})_{2}$ and $C a (H C O_{3})_{2}$ are converted to $M g (O H)_{2}$ and $C a C O_{3}$ which are insoluble and hence gets precipitated and are removed. After filtration, the water we get is soft water.
$C a (H C O_{3})_{2} Δ ⟶ C a C O_{3} ↓ + H_{2} O + C O_{2} ↑$
$M g (H C O_{3})_{2} Δ ⟶ M g (O H)_{2} + 2 C O_{2} ↑$

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Give a balanced equation for the following conversation

(E). Magnesium bicarbonate in temporary hard water to magnesium carbonate by boiling

Assertion (A): Temporary hardness of water can be removed by boiling.

Reason (R): Bicarbonates of calcium and magnesium undergo thermal decomposition.

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