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The Alchemist Discovering Phosphorus (1771) by Joseph Wright depicting Hennig Brand discovering phosphorus (the glow shown is exaggerated). Hennig Brand (German pronunciation: [ˈhɛnɪç bʁant]; c. 1630 – c. 1692 or c. 1710) was a German alchemist who lived and worked in Hamburg.
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.
[169] [170] Hafnium was the last stable element to be discovered (noting however the difficulties regarding the discovery of rhenium). 43 Technetium: 1937 C. Perrier and E. Segrè: 1937 C. Perrier & E. Segrè The two discovered a new element in a molybdenum sample that was used in a cyclotron, the first element to be discovered by synthesis. It ...
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]
Swedish chemist Carl Wilhelm Scheele uncovered tungstic acid in the mineral now known as scheelite in 1781, more than 180 years following Brahe’s death. Not long after, Spanish chemists Juan ...
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Joseph William Kennedy (May 30, 1916 – May 5, 1957) was an American chemist who co-discovered plutonium, along with Glenn T. Seaborg, Edwin McMillan, and Arthur Wahl. During World War II , he led the CM (Chemistry and Metallurgy) Division at the Manhattan Project 's Los Alamos Laboratory , where he oversaw research onto the chemistry and ...
Friedrich Wilhelm Ostwald (German: [ˈvɪlhɛlm ˈɔstˌvalt] ⓘ; 2 September [O.S. 21 August] 1853 – 4 April 1932) was a German chemist and philosopher.Ostwald is credited with being one of the founders of the field of physical chemistry, with Jacobus Henricus van 't Hoff, Walther Nernst and Svante Arrhenius. [1]