Chemist
He then turned to chemistry and developed the Weldon process to produce chlorine by boiling hydrochloric acid with manganese dioxide. MnO2 was expensive, and Weldon developed a process for its recycling by treating the manganese chloride produced with milk of lime and blowing air through the mixture to form a precipitate known as Weldon mud which was used to generate more chlorine.
Manganese dioxide reacts with hydrochloric acid to chlorine and Manganse chloride:
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