Normality (N)
Hopefully, you should now understand what equivalence means. You will now look at Normality.
The Normality of a component is exactly the same as its equivalence. Thus:
The Normality of a component is the number of gram equivalents of that component in 1000 cm3 (or 1 litre) of the total system.
You calculate Normality in the same way that you calculate equivalence.
A solution contains 2.3 grams of Sodium ions in 500 ml of solution. What is the Normality of the solution?
Find out the gram equivalent of Sodium.
Sodium has a valency of 1 and an ionic weight of 23.0.
Thus the gram equivalent value for Sodium is 23.0 grams.
Sodium has a valency of 1 and an ionic weight of 23.0.
Thus the gram equivalent value for Sodium is 23.0 grams.
Find how many gram equivalents of Sodium there are in 500 ml of solution.
Number of Equivalents = Weight of Sodium = 2.3
Sodium Gram Equivalent 23.0
Number of Equivalents = 0.1
Number of Equivalents = Weight of Sodium = 2.3
Sodium Gram Equivalent 23.0
Number of Equivalents = 0.1
Find the equivalents of Sodium in 1 litre of solution.
500ml of solution contains 0.1 Equivalents. Thus:
1000 ml of solution contains 1000/500 x 0.1 Eq = 0.2 Eq.
The concentration of Sodium in the solution is 0.2 Eq / litre ie 0.2 Normality.
500ml of solution contains 0.1 Equivalents. Thus:
1000 ml of solution contains 1000/500 x 0.1 Eq = 0.2 Eq.
The concentration of Sodium in the solution is 0.2 Eq / litre ie 0.2 Normality.
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