1.

The molecular formula of a commercial resin used for exchanging ions in wter softening is C_(8)H_(7)SO_(3Na (mol.wt.206), What would be the maximum uptake of Ca^(2+) ions by resin when expressed in moe per gram resin?

Answer»

`(2)/(309)`
`(1)/(412)`
`(1)/(103)`
`(1)/(206)`

Solution :(b) `UNDERSET(2xx206=412g)underset(2"mol")(2C_(8)H_(7)SO_(3)^(-)Na^(+))+underset(1"mol")(CA^(2+)) to (2C_(8)H_(7)SO_(3)^(-))_(2)Ca^(2+)+2Na^(+)`
`"1 mole of" Ca^(2+)=412"g of RESIN"`
`"Maximum uptake of" Ca^(2+) "ions by the resin" =(1"mol")/(412g)`


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