Pertechnetic acid (HTcO4) is a compound of technetium that is produced by reacting technetium(VII) oxide (Tc2O7) with water or reacting Tc metal or TcO2 with strong oxidizing acids, such as nitric acid, mixture of concentrated sulfuric acid with hydrogen peroxide or aqua regia. The dark red hygroscopic substance is a strong acid, with a pKa of 0.32, as such it exists almost entirely as the pertechnetate ion in aqueous solution. The red color in solution is thought to be due to the formation of the polyoxometallate Tc20O4−68, while fresh HTcO4 is white.
"}{"type":"standard","title":"Christopher Kostow","displaytitle":"Christopher Kostow","namespace":{"id":0,"text":""},"wikibase_item":"Q16215874","titles":{"canonical":"Christopher_Kostow","normalized":"Christopher Kostow","display":"Christopher Kostow"},"pageid":39758930,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/5/57/Chef_Christopher_Kostow_%282%29.jpg/330px-Chef_Christopher_Kostow_%282%29.jpg","width":320,"height":448},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/5/57/Chef_Christopher_Kostow_%282%29.jpg","width":3600,"height":5040},"lang":"en","dir":"ltr","revision":"1242067540","tid":"f6db8e3a-6258-11ef-b55a-8bc05f718d69","timestamp":"2024-08-24T20:39:31Z","description":"American chef","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Christopher_Kostow","revisions":"https://en.wikipedia.org/wiki/Christopher_Kostow?action=history","edit":"https://en.wikipedia.org/wiki/Christopher_Kostow?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Christopher_Kostow"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Christopher_Kostow","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Christopher_Kostow","edit":"https://en.m.wikipedia.org/wiki/Christopher_Kostow?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Christopher_Kostow"}},"extract":"Christopher Kostow is the executive chef at The Restaurant at Meadowood in Napa Valley, California. Under chef-owner Kostow, The restaurant was awarded three stars by the Michelin Guide consecutively from 2011 to 2019. In 2013, Chef Kostow was awarded the James Beard Foundation Award for \"Best Chef: West\".","extract_html":"
Christopher Kostow is the executive chef at The Restaurant at Meadowood in Napa Valley, California. Under chef-owner Kostow, The restaurant was awarded three stars by the Michelin Guide consecutively from 2011 to 2019. In 2013, Chef Kostow was awarded the James Beard Foundation Award for \"Best Chef: West\".
"}{"fact":"In the 1750s, Europeans introduced cats into the Americas to control pests.","length":75}
{"fact":"Cat families usually play best in even numbers. Cats and kittens should be acquired in pairs whenever possible.","length":111}
{"type":"standard","title":"Shang Kexi","displaytitle":"Shang Kexi","namespace":{"id":0,"text":""},"wikibase_item":"Q842505","titles":{"canonical":"Shang_Kexi","normalized":"Shang Kexi","display":"Shang Kexi"},"pageid":26269398,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Shang_Kexi_drawn_by_Johan_Nieuhof_in_1655.jpg/330px-Shang_Kexi_drawn_by_Johan_Nieuhof_in_1655.jpg","width":320,"height":230},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/0/0b/Shang_Kexi_drawn_by_Johan_Nieuhof_in_1655.jpg","width":2549,"height":1833},"lang":"en","dir":"ltr","revision":"1180797024","tid":"9ba07ab8-6e03-11ee-add9-6a692e29e3ae","timestamp":"2023-10-18T22:13:47Z","description":"Chinese general; Prince of Pingnan","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Shang_Kexi","revisions":"https://en.wikipedia.org/wiki/Shang_Kexi?action=history","edit":"https://en.wikipedia.org/wiki/Shang_Kexi?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Shang_Kexi"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Shang_Kexi","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Shang_Kexi","edit":"https://en.m.wikipedia.org/wiki/Shang_Kexi?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Shang_Kexi"}},"extract":"Shang Kexi was a Chinese general of the Ming and Qing dynasties. In 1576, his family migrated to Liaodong, and his father, Shang Xueli, served in the army guarding the northeast frontier. As his father did, Shang Kexi joined the army and guarded the frontier against the attack of the Jurchens. Shang was described to be a brave and resourceful man who was skilful at mounted archery and capable in military matters.","extract_html":"
Shang Kexi was a Chinese general of the Ming and Qing dynasties. In 1576, his family migrated to Liaodong, and his father, Shang Xueli, served in the army guarding the northeast frontier. As his father did, Shang Kexi joined the army and guarded the frontier against the attack of the Jurchens. Shang was described to be a brave and resourceful man who was skilful at mounted archery and capable in military matters.
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