1.

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

Answer»

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

Solution :`{:(underset("2 moles")(2C_(8)H_(7)SO_(3)^(-)Na^(+))+underset(" 1 mole")(Ca^(2+))rarr(C_(8)H_(7)SO_(3)^(-))Ca^(2+)),(=2xx206=412g""+2Na^(+)):}`
Thus, 412 G of resin take up `Ca^(2+)` ions = 1mole
`therefore" 1 g of resin will take up "Ca^(2+) " ions"=(1)/(412)"mole"`
i.e, UPTAKE of `Ca^(2+)` ions in mole per gram resin
`=(1)/(412)`


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