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Which of the following ions will caus...

Which of the following ions will cause hardness in water sample?

A

`Ca^(2+)`

B

`Na^(+)`

C

`Cl^(-)`

D

`K^(+)`

Text Solution

Verified by Experts

The correct Answer is:
A
Bicarbonate, chlorides and sulphates of Ca and Mg are responsible for the hardness of water.
Note: Hard water forms scum/precipiate with soap. Soap canatining out Ca/Mg stearate.
`(C_(17)H_(35)COONa)` reacts with hard water to precipiate out ca/Mg stearate.
` 2C_(17)H_(35)COONa(aq) + M^(2+)(aq) to (C_(17)H_(35)COO)_(2) M darr + 2Na^(+)(aq) ("where", M = Ca//Mg)`
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