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In 1871 he discovered the synthesis of phenolphthalein by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions (hence the name). That same year he was the first to obtain synthetic fluorescein , a fluorophore pigment which is similar to naturally occurring pyoverdin that is synthesised by microorganisms (e.g ...
Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols in experiments. It is a weak acid, which can lose H + ions in solution. The nonionized phenolphthalein molecule is colorless and the double deprotonated phenolphthalein ion is fuchsia. Further proton loss in higher pH occurs slowly and leads to a colorless form.
Phenolphthalein can be synthesized by the condensation of phthalic anhydride with two equivalents of phenol under acidic conditions (hence the name). It was discovered in 1871 by Adolf von Baeyer. [8] [9] [10] Synthesis of phenolphthalein [11]
Joseph Priestley FRS (/ ˈ p r iː s t l i /; [3] 24 March 1733 – 6 February 1804) was an English chemist, Unitarian, natural philosopher, separatist theologian, grammarian, multi-subject educator and classical liberal political theorist. [4]
Michael Sendivogius (/ ˌ s ɛ n d ɪ ˈ v oʊ dʒ i ə s /; Polish: Michał Sędziwój; 2 February 1566 – 1636) was a Polish alchemist, philosopher, and medical doctor.A pioneer of chemistry, he developed ways of purification and creation of various acids, metals and other chemical compounds.
Michael Bell (born 1938), together with Melanie Chartoff (born 1950), U.S. – a gray water recycling device for reuse of shower and sink water in the home; Alexander Graham Bell (1847–1922), UK, Canada, and U.S. – telephone; Nikolay Benardos (1842–1905), Russian Empire – arc welding (specifically carbon arc welding, the first arc ...
William Nicholson (13 December 1753 – 21 May 1815) was an English writer, translator, publisher, scientist, inventor, patent agent and civil engineer. He launched the first monthly scientific journal in Britain, Journal of Natural Philosophy, Chemistry, and the Arts, in 1797, and remained its editor until 1814.
Robert Augustus Chesebrough (/ ˈ tʃ iː z b r oʊ /; [1] January 9, 1837 – September 8, 1933) was an American chemist who discovered petroleum jelly—which he marketed as Vaseline—and founder of the Chesebrough Manufacturing Company.