Normality refers to the molar concentration only of the acid component or of the base component of the solution.
It is expressed as ‘N’, eq/L, or meq/L, with ‘eq’ denoting equivalents and ‘meq’ denoting millie equivalents. For titration calculations, Normality is the preferable method of measuring concentration.
Normality= gram equivalent of solute/ volume of solution in litre
It determines the chemical concentration based on the chemical reaction that is being studied. Not all reactions use this unit of measurement.
Normality is computed using grammatically equivalent weight, which is why it is rarely used. The number of ions that react in reaction determines this. This could differ depending on the reaction that occurs.
As a result, the gram equivalent weight does not remain constant. This could result in some ambiguity.
The most frequently used measure of concentration in a solution is called molarity. Molar concentration is another term for molarity. In other words, the number of moles of a solute dissolved per litre of solution.
Molarity is denoted by mol/L. It is represented as ‘M’.
Molarity = number of moles of solute/ Volume of solute in litres
The number of moles of a substance is calculated in the following manner;
Molarity changes with temperature and volume. With the increase in temperature, molarity decreases. On a similar note, when the volume of the solution increases, molarity decreases. When the number of solutes increases in the solution, so will be the morality.
The molarity of the solution also depends on the solubility of a solute. And when any additional substances are added to the solution, the molarity directly relates to the amount of solute in a solution.
Relation Between Normality And Molarity
Molarity and Normality are related as follows:
Normality = Molarity X Molar mass /Equivalent mass
For acids, the Normality can be calculated with the following formula:
Normality = Molarity x Basicity
To know the value for basicity, count the number of H+ ions an acid molecule can give.
For bases, the Normality can be calculated with the following formula:
Normality = Molarity x Acidity
To know the value for acidity, count the number of OH– ions a base molecule can give.
How to convert Molarity into Normality
The below equation will help you convert M to N.
N = M x n
Where, n= the number of equivalents
For some chemicals, when n = 1, N and M are the same.
So this is the relation between normality and molarity.