Calculations of Volumetric analysis

The subsequent points should be kept in mind while making calculations of volumetric exercises.

(i) 1g equivalent mass of a substance carries out totally with 1g equivalent mass of another substance. 1g equivalent mass of a substance means equivalent mass of the substance in grams. For instance,

1g equivalent mass of NaOH = 40g of NaOH

1g equivalent mass of H₂SO₄ = 49g of H₂SO₄

1g equivalent mass of KMnO₄ in acidic medium = 31.6 g of KMnO₄

1g equivalent mass of hydrated oxalic acid = 63g of hydrated oxalic acid

Note: Equivalent mass is a variable quantity and depends upon the reaction where the substance takes part. The nature of the reaction must be known before writing the gram equivalent mass of the substance. For instance in the reactions

The value of g equivalent mass of H₂SO₄ in reaction (i) is 98g and in reaction (ii) 49g.