Which one the following removes temporary hardness of water ?

Question

Which one the following removes temporary hardness of water ? (A) Slaked lime (B) Plaster of Paris (C) Epsom (D) Hydrolith

Tardigrade Admin · Accepted Answer

Temporary hardness is due to presence of bicarbonates of

C a

(II) and

M g

(II). Temporary hardness is removed by adding lime water or milk of lime. This method is known as Clark's process. Removal of hardness is called softening of water.

C a (O H)_{2} + C a (H C O_{3})_{2} \to 2 C a C O_{3} ↓ + 2 H_{2} O

Q. Which one the following removes temporary hardness of water ?

Slaked lime

Plaster of Paris

Epsom

Hydrolith

Temporary hardness is due to presence of bicarbonates of Ca (II) and Mg (II). Temporary hardness is removed by adding lime water or milk of lime. This method is known as Clark's process. Removal of hardness is called softening of water. Ca(OH)2​+Ca(HCO3​)2​→2CaCO3​↓+2H2​O