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Question

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (molecular weight = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?


A

1103

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B

1206

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C

2309

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D

1412

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Solution

The correct option is D

1412


We know the molecular weight of C8H7SO3Na
=12×8+1×7+32+16×3+23=206
we have to find, mole per gram of resin.
1g of C8H7SO3Na has number of mole
=weight of given resinMolecular weight of resin=1206mol
Now, reaction looks like,
2C8H7SO3Na+Ca2+(C8H7SO3)2Ca+2Na
2 moles of C8H7SO3Na combines with 1 mol Ca2+
1 moles of C8H7SO3Na will combine with 12 mol Ca2+
1206 moles of C8H7SO3Na will combine with 12×1206 mol Ca2+=1412molCa2+


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