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Acid Base Theories: Svante Arrhenius I. Introduction Svante Arrhenius was one of the towering giants of chemistry in the years surrounding the turn of the century. His most important contribution to chemistry was also his first - the idea of electrolytic dissociation. This idea first published in 1883 and in refined form in 1887, was the mainstay of his doctoral dissertation. It was the source of much hurt in his life. The basic idea is that certain substances remain ionised in solution all the time. Today, everyone accepts this without question, but it was the subject of much dissention and disagreement in 1884, when a twenty-five year old Arrhenius presented and defended his dissertation. He was bitterly disappointed when the dissertation was awarded a fourth class (non since laude approbatur - approved not without praise) and his defence a third class (cum laude approbatur - approved with praise). Essentially, he got...

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