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 calculate Normality are some of the points which are discussed in this article