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)

\frac{1}{103}

Option 2)

\frac{1}{206}

Option 3)

\frac{2}{309}

Option 4)

\frac{1}{412}

Answers (2)

As we learnt in

Stoichiometry -

Stoichiometry deals with measurements of reactants and products in a chemical reaction.

- wherein

aA (g) + bB (g) → cC (g) + dD (g)

Here, ‘a’ moles of A(g) reacts with ‘b’ moles of B(g) to give ‘c’ mole of C(g) and ‘d’ moles of D(g)

 

 From the equation. We see that 2 moles of Resin require 1 Mole 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}

Answer: Option (4)


Option 1)

\frac{1}{103}

This is an incorrect option.

Option 2)

\frac{1}{206}

This is an incorrect option.

Option 3)

\frac{2}{309}

This is an incorrect option.

Option 4)

\frac{1}{412}

This is the correct option.

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