## Normality Information

### Normality Definition and Calculation

**Normality**can be defined as - One gram equivalent of solute per liter of solution. Normality is the measure of the concentration.

*Normality= gram equivalent of solute/liter of solution*

*or*

*number of reacting units (n) multiply by Moles/Liter*

*------------------Formaula 1*

**Normality**of solution can also be expressed in terms of mass and equivalent mass:

*Normality = Mass of the solute (E) / Equivalent mass of the solute X volume of the solution in litre (V)*

*--- --------------Formula 2*

From the about information You might have got the formula , and got the answer of how to calculate Normality of any solution. Let us find out how to calculate normality with example:

**Normality Example calculate 1**

Suppose Nacl is present (Sodium Chloride) Now here find the valence (number of protons reacts) of Nacl first from the chemical reference books.

Now find the equivalent weight of Nacl : The equivalent weight is equal to the molecular weight divided by the valence.

Now sodium chloride has a valence 1 and molecular weight=58.443 so the equivalent weight will be 58.443/1= 58.443

Now 1 gm Nacl dissolved in 0.05 L of water , so by the above formula 2

**Normality**will be = 1 gram/ 58.443 equivalent mass X 0.05 L of solution

Answer will be 0.342 N solution.

Note: Molecular weight (MW) is sometimes also called as formula weight (FW)

**Normality Example Calculate 2**

Find the normality of Ammonia, Ammonia reacts with one proton only and its molecular weight is 17.03 hence its equivalent weight will be 17.03/1= 17.03g/eq

Now one more example:

Suppose a solution contains 5.300g/L of Sodium Carbonate, Find the

*normality*of solution

Step 1: Find how much protons reacts with sodium carbonate, So here two protons hence Answer is 2 protons

Step 2: Find the moles = 105.99g/mol ( Ues Molecular weight )

Step 3: Here formula 1 will be applicable

number of protons here =2

Moles = 105.99g/mol

5.300g/L solution

Hence Normality = 2 X 5.300g/105.99g/mol

=0.1000

Hence

__normality__of the given solution =0.1000 N

What is Normality, Definition of Normality, How to calculateNormalityare some of the points which are discussed in this article