Normality Calculator
Equivalents per litre, and why the factor depends on the reaction.
Equivalents per litre, and why the factor depends on the reaction.
Protons donated, electrons transferred, or charge — 2 for H₂SO₄, 1 for HCl, 3 for H₃PO₄ fully neutralised.
Normality (N)
2
1 M × 2 equivalents
Normality is molarity times the number of reactive equivalents per formula unit, so 1 M sulfuric acid is 2 N when both protons are neutralised. The catch is that the factor depends on the reaction, not the compound: sulfuric acid is 2 N against a strong base and 1 N in a reaction that takes only the first proton. A normality quoted without its reaction is incomplete, which is why IUPAC discourages the unit.
How the Normality Calculator works
Normality is molarity times the reactive equivalents per formula unit, so 1 M sulfuric acid is 2 N when both protons are neutralised. The catch is that the factor depends on the reaction rather than the compound, which is why IUPAC discourages the unit.
Also known as: normality to molarity converter · equivalents per litre calculator · gram equivalent calculator · how to calculate normality
Where to go next
The Normality question rarely arrives on its own. These are the ones that usually come with it:
- Molarity Calculator — Moles per litre of solution — not of solvent.
- Molality Calculator — Per kilogram of solvent — not per litre of solution.
- Titration Calculator — Equivalence by equivalents, not by moles.
- Neutralization Calculator — Equivalents, so polyprotic acids need no extra step.
Frequently asked questions
How do I convert molarity to normality?
Multiply by the number of equivalents — protons donated, electrons transferred, or charge. 1 M H₂SO₄ is 2 N against a strong base.
Why is normality discouraged?
Because the same solution has different normalities in different reactions. Sulfuric acid is 2 N when both protons react and 1 N when only the first does, so a normality quoted without its reaction is incomplete.
Where is it still used?
Titration and water treatment, where the reaction is fixed by the protocol and normality makes the arithmetic at the equivalence point trivial.
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Related calculators
Molarity Calculator
Moles per litre of solution — not of solvent.
OpenMolality Calculator
Per kilogram of solvent — not per litre of solution.
OpenTitration Calculator
Equivalence by equivalents, not by moles.
OpenNeutralization Calculator
Equivalents, so polyprotic acids need no extra step.
Open