Relation Between Normality And Molarity

What is Normality?

Normality can be defined as gram equivalent of solute dissolved in one cubic decimeter or one liter of solution. The unit of normality is N. It is most preferred during titration calculations. Normal solutions have normality equal to unity.

Normality = \(\frac{Molecular\;mass}{Equivalent\;mass\;of\;solute}\)

Decinormal is calculated as follows:

N/10 = 0.1 N

Seminormal is calculated as follows:

N/2 = 0.5 N

The strength of a solution can be calculated by finding the product of equivalent mass and normality. It is expressed in grams per liter.

What is Molarity?

Molarity can be defined as the number of moles of solute dissolved in one cubic decimeter or one liter of solution. The unit of molarity is M or mol L-1 or mol dm-3. It is a preferred unit of concentration.

Molarity = \(\frac{Number\;of\;moles\;of\;solute}{Volume\;of\;solution\;in\;litres\;or\;dm^{3}}\)

The number of moles of a substance can be calculated as follows:

Number of moles = \(\frac{Given\;mass\;of\;a\;substance}{Molecular\;mass\;of\;the\;substance}\)

As the temperature changes, the volume changes and therefore the molarity also changes.

Decimolar is calculated as follows:

M/10 = 0.1 M

Semimolar is calculated as follows:

M/2 = 0.5 M

Pentimolar is calculated as follows:

M/5 = 0.2 M

Centimolar is calculated as follows:

M/100 = 0.01 M

Millimolar is calculated as follows:

M/1000 = 0.001 M

Relation Between Normality And Molarity

Molarity and Normality are related as follows:

Normality = \(Molarity X \frac{Molar\;mass}{Equivalent\;mass}\)

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 to Normality?

The below equation will help you convert M to N.

N = M*n

Where,

n = the number of equivalents

For some chemicals, when n = 1, N and M are the same.

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