Published by: Nuru
Published date: 25 Jun 2021
Normality of a solution is defined as the number of gram equivalent of solute dissolved in 1 litre of solution. The normality of a solution is the gram equivalent weight of a solute per litre of solution. It may also be called the equivalent concentration. … For example, the concentration of a hydrochloric acid solution might be expressed as 0.1 N HCl. Mathematically, it can be expressed as:-
Normality= (No. of gram equivalent of solute) / (Volume in liters of a solution)....(i)
If one gram equivalent of solute dissolves in one litre of a solution then such type of solution is called one normal solution or simply a normal solution.
we know that,
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Molarity and Moral solution:-
The morality of a solution is defined as the number of moles of solute dissolved in one litre of a solution. Mathematically, it can be expressed as:-
Molarity = (no. of moles of solute) / Vol. in liters of a solution....(iv)
If one mole of solute dissolves in one litre of the solution then such type of solution is called one molar solution or simply molar solution.
We know that,
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From eqn (iii) and (vi) we get,
Normality × equivalent weight= molarity × molecular weight….. (vii)
This is the required expression for the relation between normality and molarity.
From eqn (vii)
Normality × Eq. wt = molarity × mol. Wt
or, Normality = Molarity × (Mol.Wt/ Eq.Wt)
or, Normality = Molarity × Acidity (In case of base)
or, Normality = Molarity × Basicity (In case of acid)
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