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

Option: 1

0.0097


Option: 2

0.0049


Option: 3

0.0065


Option: 4

0.0024


Answers (1)

best_answer

The chemcial reaction is as follows:

2C_{8}H_{7}SO_{3}Na\, +\, Ca^{2+}\, \rightarrow \, (C_{8}H_{7}SO_{3})_{2}Ca\, +\, 2Na^{+}
From the equation, we see that 2 moles of Resin require 1 Mole of Ca^{2+}

Molecular weight of resin is 206.

412 gm of resin require 1 Mole Ca^{2+}

\therefore   Maximum uptake of Ca^{2+} is =\frac{1}{412}

 

Posted by

Rishi

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