Equivalents and Valency
You may have realised that the gram equivalent of an element or ion is its atomic/ionic weight divided by its valency and this provides a quick way of working out the gram equivalent for a substance.
Gram Equivalent = Atomic/Ionic Weight grams
Valency
Valency
Click on the following examples.
F
NO3-
Ca
CO32-
AI
Fluorine
Fluorine has a valency of 1 and its atomic weight is 19.0.Thus the gram equivalent of Fluorine is:
Atomic Weight g = 19.0 g = 19.0 g
Valency 1
The gram equivalent of Fluorine is 19.0 grams.
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Nitrate
Nitrate has a valency of 1 and its ionic weight is 62.0.Thus the gram equivalent of Nitrate is:
Atomic Weight g = 62.0 g = 62.0 g
Valency 1
The gram equivalent of Nitrate is 62.0 grams.
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Calcium
Calcium has a valency of 2 and its atomic weight is 40.1.Thus the gram equivalent of Calcium is:
Atomic Weight g = 40.1 g = 20.05 g
Valency 2
The gram equivalent of Calcium is 20.05 grams.
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Carbonate
Carbonate has a valency of 2 and its ionic weight is 60.0.Thus the gram equivalent of Nitrate is:
Atomic Weight g = 60.0 g = 30.0 g
Valency 2
The gram equivalent of Carbonate is 30.0 grams.
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Aluminium
luminium has a valency of 3 and its atomic weight is 27.0.Thus the gram equivalent of Aluminium is:
Atomic Weight g = 27.0 g = 9.0 g
Valency 3
The gram equivalent of Aluminium is 9.0 grams.
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What is the gram equivalent of the Sulphate ion, given that its ionic weight is 96.1 g?
Click on your choice below.
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