Question

Equivalent weight of orthophosphoric acid

Answer 1

Orthophosphoric acid  is H3PO4
​The molecular weight is 98g
Since the basicity is =3 [i.e the no.of H+ ions which it can lose =3]
Equivalent weight = 98/3
                             = 32.67g

Answer 2

Equivalent weight of orthophosphoric acid 32.67 gm/equivalent.

Explanation:  

• The molecular formula of orthophosphoric acid is $\bold{H_{3} P O_{4}}$. Now the atomic weight of oxygen is 16, Phosphorus is 31 and hydrogen is 1.  

• So the molecular weight is equal to $31+3+16 \times 4$. This is equal to 98. Now one molecule of the acid liberated three H+ ion to reduce three molecules of a base.  

• Hence the equivalency is 3. Hence the equivalent weight is equal to 98 / 3, this is equal to 32.67 gm/ equivalent.

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