Question

Describe clark's method for removal of temporary hardness of water.Write chemical equation involved.

Answer 1

Adding Slaked Lime (Clark's Process) :-

In Clark's process, slaked lime, Ca(OH)2 is added to temporary hard water. Insoluble calcium carbonate precipitate out and no longer produce hardness.

Answer 2

Clark’s method of hardness removal is a temporary hardness removal method.

In this method some  amount of calcium hydroxide is added to the hard water, because of that some insoluble carbonates are  found, which are separated through the method of filtration.

The slaked lime and the calcium hydroxide  is added with the hard water (Temporary). And then the insoluble calcium carbonate can be precipitated  out by filtration and there is no longer hardness can be produced.

$\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}+\mathrm{CaCO}_{3} \rightarrow 2 \mathrm{CaCO}_{3}+2 \mathrm{H}_{2} \mathrm{O}$