Question

Calculate the equivalent weight of the following substance as acid or base.

$S{O}_2{\left(OH\right)}_2$
If $M$ is the molecular weight and $E$ the equivalent weight, then :

• A. $E=\frac{M}{2}$
• B. $E=\frac{M}{4}$
• C. $E=\frac{M}{3}$
• D. none of these

Answer 1

Answer: (A)

$E=\frac{M}{2}$

1 mole of $S{O}_2{\left(OH\right)}_2$ contains 2 ionisable hydrogen ions.( H2SO4)

Hence, its equivalent weight is equal to one fourth of its molecular weight.

$\text{Equivalent mass of a acid}=\frac{\text{Molar mass of the acid}}{\text{Number of replaceable hydrogen ions}}$
$E=\frac{\text{M}}{2}$