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A hard water sample contains magnesium b...

A hard water sample contains magnesium bicarbonate only. 100 ml of the hard water sample requires 10 ml. of standard soap solution (1 ml soap solution = 1 mg `CaCO_3` ) to get good lather. Find out of the weight of `Ca(OH_2)` to be added to 10 Kg water sample to make it soft water.

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The correct Answer is:
`1.48`g
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