The analytical concentration of a solute is the sum of the concentrations of the species to which it is produced. It is also called total concentration.
For a generic solute A is indicated as CA.
The analytical concentration can be expressed by the mass balance: from the law of mass conservation we derive the relationship with the equilibrium concentrations of the species that form in solution.
In the case of hydrogen sulphide: H2S ⇋ HS + H HS ⇋ S + H
CH2S = [H2S] + [HS] + [S]
That is, the sum of the unbound concentration equilibrium concentrations, the conjugated base due to the first dissociation and completely dissociated acid (sulfur anion).
For soluble salts, the analytical concentration is equal to that of its components. Considering sodium chloride: NaCl → Na(aq) + Cl(aq)
CNaCl = CNa = CCl = [Na] = [Cl]
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