Before revision: A Bjerrum plot (named after Niels Bjerrum ; sometimes also known as a Sillén diagram or a Hägg diagram ) is a graph of the concentrations of the different species of a polyprotic acid in a solution, as a function of pH, when the solution is at equilibrium.
After revision: A Bjerrum plot (named after Niels Bjerrum ),(after Lars Gunnar Sillén),(after Gunnar Hägg sometimes also known as a Sillén diagram or a Hägg diagram ) is a graph of the concentrations of the different species of a polyprotic acid in a solution, as a function of pH, when the solution is at equilibrium.