EXAMPLE 18 Calculate equivalent mass of (a) HNO₃ (b) H₂SO₄ (c) H₃PO₄ (d) NaOH q (e)
EXAMPLE 19 Calculate equivalent mass of H₃ PO₄ if, H₃ PO_​4 +2NaOH $\to$Na₂HPO₄ +2H_​2 O