Redis co very of the Elements Sir Humph ry Davy and the Alkalis I I I James L. Marshall, Beta Eta 1971 , and Virginia R. Marshall, Beta Eta 2003 , Department of Chemistry, University of North Texas, Denton, TX 76203-5070,
[email protected] In a previous HEXAGON article on Joseph Black, 1h the three alkalis known in the 1700s were listed: “vegetable alkali” (potash), “mineral alkali” (soda), and “volatile alkali” (ammonia). 1h Figure 1. Royal Institution, 21 Albemarle St. (N51° 30.58 W00° 08.55), was founded in 1799 and has not All were known to react vigorously with acids changed its location since. The Institution was founded by Sir Benjamin Thompson, Count Rumford and “to change the color of syrup of violets to (1753 –1814), an American born British scientist who through observing the boring of cannons realized green.” Ammonia was apparently a compound heat was created by friction. 10,11a of nitrogen and hydrogen ,2d as shown by His colorful history included his 1804 Claude Louis Berthollet (174 8–1822) at his marriage to Marie-Anne Lavoisier, the famous laboratory at Arcueil. 1c It was natural, widow of the famous Antoine Lavoisier. 11a therefore, that Antoine-Laurent Lavoisier (1743 –1794) himself, the “father of modern Figure 2. Royal Institution, appearance in chemistry,” 1b who first recognized the true ele - 1838 (painting by Thomas H. Shepherd, ments and listed 31 that are now found in the 179 3–1864). At this time Michael Periodic Table, 3 would exclude the “fixed alka - Faraday was prominent among its scien - lis” —potash and sod a—from his list, 3 because tists, having succeeded Humphry Davy, they might be compounds of nitrogen as well.