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Water softening by Clark.s process uses...

Water softening by Clark.s process uses

A

`Ca(OH)_2`

B

`Na_2CO_3`

C

`NaHCO_3`

D

`CaHCO_3`

Text Solution

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The correct Answer is:
A
Removal of temporary hardness by Clark.s method: Temporary hardness can also be removed by treating hard with calculated amount of lime. It precipitates out calcium carbonate and magnesium hydoxide which can be filtered off. The method is known as Clark.s methods.
`Ca(HCO_3)_2 +Ca(OH)_2 to 2CaCO_3 darr + 2H_2O`
`Mg(HCO_3)_2 + 2Ca(OH)_3 to 2CaCO_3 darr + Mg (OH)_3 darr + 2H_2O`
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