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Leblanc, Nicolas (1742–1806)
French chemist who invented the Leblanc process for obtaining alkali (sodium carbonate) from common salt. The salt was treated with sulfuric acid to give sodium sulfate, which was then heated with chalk and charcoal to give a "black ash" from which the sodium carbonate could be washed with water. The process was supplanted late in the 19th century by the Solvay process.
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