How is the equilibrium calculated in solutions of weak polybasic acids and weak polyacid bases?

The dissociation of weak polybasic acids and weak polyacid bases in the second and subsequent stages is negligible and much less than the dissociation in the first stage. Therefore, the calculation of equilibrium in solutions of these compounds is carried out only taking into account the first stage of dissociation according to the formulas for calculating the pH for a weak acid or a weak base.

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