Eqv. Mass of A = Mass of A
Eqv. Mass of B Mass of B
This relation tells that the combining mass reactants is always in the ratio of their equivalent mass. This law is also known as law of chemical equivalence.
- Atomic Mass = Eqv. Mass X Valency
- ‘Gram Eqv.’ or ‘Eqv.’
Eqv. mass of a substance, expressed in gram is ‘one gram equivalent’ or ‘1 eqv.’
Equivalent Mass of a compound
1. Eqv. mass of acid
= Molecular Mass of acid/Basicity
Where Basicity of an acid is defined as no. of H+ ions displaced or OH- ions combined per molecule of the acid.
Eqv. mass of H2SO4 = 98 / 2 = 49
2. Eqv. mass of base
= Molecular Mass/Acidity
Where acidity of the base is defined as the no. of H+ ions consumed or OH- ions displaced per molecule of the base.
Eg.
Eq. Mass of Ca(OH)2 = 74/2 = 37
3. Eqv. mass of salt
= Molecular Mass of Salt/Total no. of charge in basic or acid radical per molecule
Eg.
Eq. mass of Na2CO3 = 106 / 2 = 53
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