Moissan isolating fluorine. 19th-century illustration of French chemist Henri Moissan (1852-1907) isolating fluorine in 1886. The electrolysis set-up
Moissan isolating fluorine. 19th-century illustration of French chemist Henri Moissan (1852-1907) isolating fluorine in 1886. The electrolysis set-up at right centres on a beaker containing a U-tube in a cooling liquid (at minus 23 degrees Celsius). The U-tube contains a solution of potassium fluoride (provides electrical conductivity) in hydrofluoric acid. The electrical wires connect to electrodes (iridium/platinum) dipped inside the U-tube. Side tubes allow collection of the products (hydrogen gas, right; fluorine gas, left). Moissan was awarded the 1906 Nobel Prize in Chemistry for his work on fluorine and electric arc furnaces. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).
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