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Svante Arrhenius was able to establish the indisputable facts that ions exist in a aqueous solution. His efforts did win him a Nobel Peace prize. It is true that the H+ ions and the OH- ions he discovered are very important to a chemists' work.
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Brønsted was a major influence in the study of acids and bases, and became known as somewhat an authority on the like. These were his first papers on electron affinity.
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In 1909 (specific month and date not known) Søren Peder Lauritz Sørensen discovered the concept to the pH scale. However, it wasn't completely understood and usable for another fifteen years.
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Brønsted published papers once more, this time being his protonic theory on acid-base reactions. This was another contribution he made to further the study of acids and bases
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Gilbert N. Lewis proposed his electronic theory of acids and bases the same year that Brønsted published his papers. Though they were both very distinct hypotheses, they complimented one another.