A sample of water contains Mg(HCO_3)_2 and Ca | vedclass

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(C) Temporary hardness in water is caused by the presence of magnesium and calcium hydrogen carbonates. When water containing $Mg(HCO_3)_2$ and $Ca(HC

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$Mg(OH)_2, CaCO_3$

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(C) Temporary hardness in water is caused by the presence of magnesium and calcium hydrogen carbonates. When water containing $Mg(HCO_3)_2$ and $Ca(HCO_3)_2$ is boiled, these compounds decompose. $Ca(HCO_3)_2$ decomposes to form calcium carbonate $(CaCO_3)$, which is a precipitate: $Ca(HCO_3)_2 \xrightarrow{\Delta} CaCO_3 \downarrow + H_2O + CO_2 \uparrow$. $Mg(HCO_3)_2$ decomposes to form magnesium hydroxide $(Mg(OH)_2)$ because $Mg(OH)_2$ is less soluble than $MgCO_3$: $Mg(HCO_3)_2 \xrightarrow{\Delta} Mg(OH)_2 \downarrow + 2CO_2 \uparrow$.

$A$ sample of water contains $Mg(HCO_3)_2$ and $Ca(HCO_3)_2$. On boiling this water, these hydrogen carbonates are removed as precipitates. The precipitates are

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