Question

Temporary hardness of water is due to the presence of the sulphates of Ca and Mg.
If this is true enter 1, if false enter 0.

Answer 1

Temporary hardness of water is due to the presence of the bicarbonates of $Ca$ and $Mg$.

Temporary hardness is water hardness due to the presence of calcium and magnesium carbonates and bicarbonates, which can be precipitated by heating the water. It can be removed by processes such as boiling or lime softening, and then separation of water from the resulting precipitate.

$Ca\left(HC{O}_3{)}_2\stackrel{\Delta }{\to }CaC{O}_3\right(ppt)+H_{2}O+C{O}_2$

$Mg\left(HC{O}_3{)}_2\stackrel{\Delta }{\to }MgC{O}_3\right(ppt)+H_{2}O+C{O}_2$