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Why \mathrm{Ca}\left(\mathrm{HCO}_3\right)_2 and  \mathrm{Mg}\left(\mathrm{HCO}_3\right)_2  cause temporary hardness?

Option: 1

Because they can be filtered off from the water.


Option: 2

Because they crystallise out from cold water.


Option: 3

Because they decompose on boiling the water.


Option: 4

Because they decompose on adding acid into the water.


Answers (1)

best_answer

The decomposition reaction is given by:

2 \mathrm{HCO}_3{ }^{-} \leftrightarrow \mathrm{CO}_3{ }^{2-}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}

Posted by

Ajit Kumar Dubey

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