Normality and Normal Solution

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Normality and Normal Solution

Published by: Nuru

Published date: 25 Jun 2021

Normality and Normal Solution Photo

Normality and Normal Solution

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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