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JEE Main2015ChemistrySome Basic Concepts of ChemistryActual

The molecular formula of a commercial resin used for exchanging ions in water softening is C 8 H 7 S O 3 N a molecular weight = 206 . What would be the maximum uptake of C a 2 + ions by the resin if expressed in mol per gm ?

Options

  1. A1 412
  2. B1 103
  3. C1 206
  4. D2 309

Correct answer

A. 1 412

Step-by-step solution

2 C 8 H 7 SO 3 Na   aq + Ca 2 +   aq → C 8 H 7 SO 3 2 Ca   aq + 2 Na + aq 1 mol calcium ion reacts with 2 moles of resin 2   mol   resin = 412   g resin ≡ 40   g Ca 2 + ions = 1   mol   of   Ca 2 + ions ∴   Moles   of   Ca 2 + per g   of   resin = 1 412

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