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?

  1. A

    1/103

  2. B

     1/206 

  3. C

    2/309

  4. D

    1/412

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    Solution:

    The exchanging reaction is 2C8H7SO3Na+Ca2+C8H7SO32Ca+2Na+ For one mole of  Ca2+ ions, two moles of resin is required. Thus, the maximum uptake of  Ca2+ ions will be 1molCa2+/2mol resin =1 mole Ca2+/(2 x 206) g resin(1/412)molCa2+/g of resin

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