Calculadora de Normalidade

The Normality Calculator determines the normal concentration of a solution, expressed in equivalents per liter (eq/L). Normality is useful in neutralization, redox, and precipitation reactions because it accounts for the amount of reactive species (equivalents) present. The formula used is N = (mol × n_factor) / V, where mol is the amount of solute in moles, n_factor is the number of equivalents per mole (number of H⁺, OH⁻, or electrons involved), and V is the volume of the solution in liters.

How to use: enter the number of moles of solute, the n factor (equivalents per mole), and the volume of the solution in liters. The calculator returns the normality. For example, for 0.5 mol of H₂SO₄ (n=2) in 1 L, the normality is 1.0 eq/L. This means the solution has 1 equivalent of H⁺ per liter, useful for acid-base titrations.

When to use: in chemistry labs to prepare standard solutions, in titrimetric analyses (such as determining acidity or alkalinity), and in stoichiometric calculations involving reactions with reactive ions. Normality is especially useful when the reaction is not 1:1 in moles, such as in redox reactions with different numbers of electrons.

Precautions: verify the correct n factor for the specific reaction. For acids, n is the number of ionizable H⁺; for bases, the number of OH⁻; for oxidants/reductants, the number of electrons transferred. The volume must be in liters. Remember that normality can vary with the reaction, unlike molarity which is fixed.