Normality Calculator

The Normality Calculator computes the normality (equivalent concentration) of a solution. Normality expresses the number of gram equivalents of solute per liter of solution and is widely used in titrations and acid-base chemistry.

$$N = \frac{m}{E \times V}$$

where $N$ is normality (eq/L or N), $m$ is the mass of solute in grams, $E$ is the equivalent weight in g/eq, and $V$ is the solution volume in liters.

Equivalent weight equals molar mass divided by the valence (number of reactive equivalents per mole). For NaCl, $E = 58.443$ g/eq. Dissolving 3 g in 0.1 L gives $N = 3 / (58.443 \times 0.1) = 0.5133$ N.

Normality relates to molarity by $N \times E = M \times \text{Molar mass}$, where $M$ is molarity in mol/L.

Frequently Asked Questions

What is normality?

Normality (N) is the number of gram equivalents of solute per liter of solution. One equivalent is the amount that can donate or accept one mole of hydrogen ions in a reaction.

How is normality different from molarity?

Molarity counts moles of solute per liter. Normality counts equivalents per liter, which depends on the valence. For H₂SO₄ (valence 2), normality is twice the molarity.

How do I find equivalent weight?

Divide the molar mass by the valence. For sulfuric acid (H₂SO₄), molar mass is 98.079 g/mol and valence is 2, so equivalent weight is 49.04 g/eq.

When is normality used?

Normality is common in titration calculations, neutralization reactions, and medical serums where reactive capacity matters more than absolute mole count.

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Normality Calculator

Normality Calculator

Frequently Asked Questions

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