Question

$4H_{3}P{O}_3⟶3H_{3}P{O}_4+P{H}_3$
Equivalent weight of $H_{3}P{O}_3$ is (as nearest integer)

Answer 1

$4H_{3}P{O}_3⟶3H_{3}P{O}_4+P{H}_3$
+3 +5 -3
Equivalent weights $E_1=\frac{mol.wt.}{2}{E}_2=\frac{mol.wt.}{6}$
$\therefore$ Eq. wt. of $H_{3}P{O}_3$ in disproportionation reaction
$=E_1+E_2$
$=\frac{2}{3}mol.wt.=\frac{2}{3}\times 82$
$=54.67$