Question

What should be the equivalent weight of phosphorous acid, if P=31; O=16; H=1

• A. 82
• B. 41
• C. 20.5
• D. None of these

Answer 1

The correct option is B 41

The acid is dibasic.
Molecular weight of $H_{3}P{O}_3=3+31+48=82$
$\therefore$ Equivalent weight $=\frac{Molecularweight}{Basicity}=\frac{82}{2}=41$.