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Arrhenius plot for the dissociation of the heptahydrated (dotted lines), hexahydrated (solid lines), and pentahydrated (dashed lines) alkaline earth metal ions. The Arrhenius data for the tetrahydrated barium ions are also shown (dashed–dotted line). Magnesium, calcium, strontium, and barium ions are represented by ○, ▪, •, and ▵, respectively.
