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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
s Block Elements

NTA Abhyas 2020 · Chemistry · s Block Elements

The molecular formula of a commercial resin used for exchanging...

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na{C}_{8}{H}_{7}S{O}_{3}Na (Molecular weight 206). What would be the maximum uptake of Ca2+Ca^{2 +} ions by the resin when expressed in mole per gram resin?

Options

  1. A2309\dfrac{2}{309}
  2. B1412\dfrac{1}{412}
  3. C1103\dfrac{1}{103}
  4. D1206\dfrac{1}{206}

Correct answer

B. 1412\dfrac{1}{412}

Step-by-step solution

\mathop{2{C}_{8}{H}_{7}S{O}_{3}^{-}Na^{+}}_{\mathop{2\text{mol}_{( 2 \times 206 = 412\text{g} )}} + \mathop{Ca^{2 +}}_{1\text{mol}} \to {\left({C}_{8}{H}_{7}S{O}_{3}^{-}\right)}_{2}Ca^{2 +} + 2Na^{+}

1 mol of Ca2+≡412Ca^{2 +} ≡ 412 g of resin

Maximum uptake of Ca2+Ca^{2 +} ions by the resin

=1mol412g=1412mol/g= \dfrac{1\text{mol}}{412\text{g}} = \dfrac{1}{412}mol / g
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