Potassium

1807

Potassium

The book of science

Tom Sharp


LondonHumphry Davy elements

Potassium

Atomic number 19

Essential stuff


Since ancient times, potash was obtained by putting leaf or wood ashes in a pot, leaching the ashes with water, and evaporating the solution. Saltpeter was obtained from decaying vegetation, sewage, or farmyard manure, also leached and evaporated. Potassium salts and sodium salts are chemically similar, so people did not realize that they were compounds of different elements.

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