Redox and Equivalent ConceptHard

Question

A quantity of 1.0 g of an acid when completely acted upon by magnesium gave 1.301 g of the anhydrous magnesium salt. The equivalent weight of the acid is

Options

A.35.54
B.36.54
C.48
D.49

Solution

Let the acid be HnA.

neq acid = neq magnesium salt

$\text{Or }\frac{1.0}{1 + E_{A^{n -}}} = \frac{1.301}{12 + E_{A^{n -}}} \Rightarrow E_{A^{n -}} = 35.54$

∴ Equivalent weight of acid = 1 + 35.54 = 36.54.

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