1.

The molecular formula of a commercial resin used for exchanging ions in water softening is C_8H_7SO_3Na(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 :`Ca^(2+) + 2C_8H_7SO_3Na to Ca (C_8H_7SO_3)_2 + 2Na `
Molecular MASS of `C_8H_7SO_3Na`
` = 12 XX 8 + 1 xx 7 + 32 xx 1 + 16 xx 3 + 23 xx 1= 206`
2 moles of `C_8H_7SO_3Na` require 1 mol of `Ca^(2+)`
` 2 xx 206 g ` of `C_8H_7SO_3 Na + 1 ` mol of `Ca^(2+)`
1g of `C_8H_7SO_3Na = 1/412 ` mol
` therefore ` maximum uptake ` = 1/412 ` mol/g


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