Normality Calculator

Normality measures a solution's concentration in terms of reactive capacity — specifically how many equivalents of a solute are dissolved per liter. Enter the mass of solute, molecular weight, valency (n-factor), and volume of solution into the Normality Calculator to get the Normality (N) of your solution. Secondary outputs include equivalent weight, molarity, and volume converted to liters. Also try the Dilution Factor Calculator.

g

Mass of the solute dissolved in the solution

g/mol

Molecular weight of the solute compound

Number of H+ or OH- ions per molecule

mL

Total volume of the solution

Results

Normality (N)

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Equivalent Weight

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Molarity (M)

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Volume in Liters

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Frequently Asked Questions

What do you mean by normality?

Normality (N) is a measure of concentration that expresses the number of gram equivalents of solute per liter of solution. It considers both the molarity and the number of reactive units (H+ or OH- ions) in each molecule. See also our pKa Calculator.

How do I calculate normality?

Normality is calculated using the formula: N = Mass of solute / (Equivalent weight × Volume in liters). The equivalent weight equals molecular weight divided by valency (n-factor).

What is the difference between molarity and normality?

Molarity measures moles of solute per liter of solution, while normality measures gram equivalents per liter. Normality accounts for the number of reactive ions, making it more useful for acid-base reactions.

How do I calculate the normality of an acid or base from its molarity?

To convert molarity to normality, multiply the molarity by the valency (n-factor): Normality = Molarity × n-factor. For example, H2SO4 has n=2, so 1M H2SO4 = 2N H2SO4. You might also find our Solution Mixtures Calculator useful.

What is equivalent weight and how is it calculated?

Equivalent weight is the molecular weight divided by the valency (n-factor). It represents the mass of a substance that can donate or accept one mole of electrons or protons in a reaction.

What is the valency or n-factor for common acids and bases?

For acids, n-factor equals the number of H+ ions: HCl (n=1), H2SO4 (n=2), H3PO4 (n=3). For bases, it equals OH- ions: NaOH (n=1), Ca(OH)2 (n=2), Al(OH)3 (n=3).

When should I use normality instead of molarity?

Use normality for acid-base titrations, redox reactions, and precipitation reactions where the number of reactive equivalents matters. Molarity is preferred for general solution preparations and stoichiometric calculations.