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Polyprotic acids are able to donate more than one proton per acid molecule, in contrast to monoprotic acids which donate only one proton per molecule. Polyprotic acids can undergo multiple dissociations depending on the pH value. Each dissociation has its own dissociation constant.

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The program POLYPROTIC allows to calculate the distribution of the dissociated ions of mono-, di-, tri-, and tetra-protic acids. The user can set the pKa values of the protonated species and immediately sees the distribution of the ions in dependence of the pH value.
Many thanks to Ihor Patsay, Ivan Franko National University of Líviv, Ukraine, who contributed the acid-base titration simulation to the Learning by Simulations Web site.


Last Update: 2008-Feb-27