Formality or analytical concentration

If a molecule or salt dissociates in solution, the concentration refers to the original chemical formula in solution, the molar concentration is sometimes called formal concentration or formality (F_A) or analytical concentration (c_A). For example, if a sodium carbonate solution has a formal concentration of c = 1 mol/L, the molar concentrations are c = 2 mol/L and c = 1 mol/L because the salt dissociates into these ions.

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