RH(2) (ion exchange resin) can replace C...

`RH_(2)` (ion exchange resin) can replace `Ca^(2+)` ions in hard water as `RH_(2)+Ca^(2+) to RCa+2H^(+)`. If 1L of hard water after passing through `RH_(2)` has pH=3 then hardness in parts per million of `Ca^(2+)` is :

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