Chemistry 12 Notes for Chemistry Notes

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Volumetric Analysis Formulae

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This relation tells that the combining mass ratio of reactants is always in the ratio of their equivalent masses. This law is also termed as law of chemical equivalence.

  • Atomic mass = eqv. Mass x valency

  • G. eqv. / eqv. = Equivalent mass of substance expressed in grams is 1 g. eqv. Or 1 eqv.


  • Eqv. Mass of a compound.



Where basicity of acid is defined as the no. of H+ ­ions displaced or OH– ions combined per molecule of the acid.
eg. Eqv. Mass of H2SO4 = 98/2 = 49


Where acidity of the base is defined as the no. of H+ ions combined or OH– ions displaced per molecule of the base.
eg. Eqv. Mass of Ca(OH)2 = 74/2 = 37


eg. Eqv. Mass of Na2Co3 = 106/2 = 53


eg. Eqv. Mass of CO3— ­= 60/2 = 30
Eqv. Mass of Na+ = 23/1 = 23
In the case of acid, base and salt, the eqv. Mass can be obtained by the summation of positive and negative radical.

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