{"id":353,"date":"2023-07-23T23:02:40","date_gmt":"2023-07-23T23:02:40","guid":{"rendered":"https:\/\/chemuza.org\/pt\/anidrido-acetico\/"},"modified":"2023-07-23T23:02:40","modified_gmt":"2023-07-23T23:02:40","slug":"anidrido-acetico","status":"publish","type":"post","link":"https:\/\/chemuza.org\/pt\/anidrido-acetico\/","title":{"rendered":"Anidrido ac\u00e9tico \u2013 c4h6o3, 108-24-7"},"content":{"rendered":"<p>O anidrido ac\u00e9tico \u00e9 um composto org\u00e2nico l\u00edquido incolor e de cheiro pungente usado em s\u00edntese org\u00e2nica, produ\u00e7\u00e3o de acetato de celulose e fabrica\u00e7\u00e3o de aspirina.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td> <strong>Nome IUPAC<\/strong><\/td>\n<td> Anidrido etan\u00f3ico<\/td>\n<\/tr>\n<tr>\n<td> <strong>F\u00f3rmula molecular<\/strong><\/td>\n<td> C4H6O3<\/td>\n<\/tr>\n<tr>\n<td> <strong>Identifica\u00e7\u00e3o CAS<\/strong><\/td>\n<td> 108-24-7<\/td>\n<\/tr>\n<tr>\n<td> <strong>Sin\u00f4nimos<\/strong><\/td>\n<td> \u00d3xido ac\u00e9tico, anidrido de \u00f3xido ac\u00e9tico, acetanidrido, anidrido de \u00e1cido ac\u00e9tico, acetato de acetila, anidrido de acetila, anidrido etan\u00f3ico<\/td>\n<\/tr>\n<tr>\n<td> <strong>InChI<\/strong><\/td>\n<td> InChI=1S\/C4H6O3\/c1-2-3-4(5)6\/2-1-3(5)4\/h2-3H,1H3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\"> <strong>Propriedades do anidrido ac\u00e9tico<\/strong> <\/h2>\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/chemuza.org\/wp-content\/uploads\/2023\/08\/acetic-anhydride.jpg\" alt=\"Anidrido ac\u00e9tico\" width=\"220\" height=\"78\" srcset=\"\" sizes=\"auto, \"><\/figure>\n<\/div>\n<h3 class=\"wp-block-heading\"> Massa molar de anidrido ac\u00e9tico<\/h3>\n<p> O anidrido ac\u00e9tico tem massa molar de 102,09 g\/mol. \u00c9 um l\u00edquido incolor, altamente inflam\u00e1vel e que emite um odor pungente. O acetanidrido \u00e9 utilizado na s\u00edntese de v\u00e1rios produtos qu\u00edmicos, como aspirina, acetato de celulose e acetato de vinila. Tamb\u00e9m \u00e9 utilizado na produ\u00e7\u00e3o de corantes, tintas e perfumes.<\/p>\n<h3 class=\"wp-block-heading\"> Ponto de ebuli\u00e7\u00e3o do anidrido ac\u00e9tico<\/h3>\n<p> O anidrido ac\u00e9tico tem um ponto de ebuli\u00e7\u00e3o de 141,2\u00b0C. \u00c9 um composto polar, o que significa que possui carga parcial positiva e negativa, o que lhe permite formar liga\u00e7\u00f5es de hidrog\u00eanio com outras mol\u00e9culas. Esta propriedade tamb\u00e9m contribui para o seu alto ponto de ebuli\u00e7\u00e3o. O acetanidrido tamb\u00e9m \u00e9 muito reativo, por isso \u00e9 importante manuse\u00e1-lo com cuidado no laborat\u00f3rio.<\/p>\n<h3 class=\"wp-block-heading\"> Densidade de anidrido ac\u00e9tico g\/ml<\/h3>\n<p> O anidrido ac\u00e9tico tem densidade de 1,08 g\/ml. \u00c9 um l\u00edquido \u00e0 temperatura ambiente e possui alta viscosidade, o que o torna mais espesso que a \u00e1gua. \u00c9 importante considerar esta propriedade ao usar acetanidrido em rea\u00e7\u00f5es ou ao manuse\u00e1-lo em laborat\u00f3rio.<\/p>\n<h3 class=\"wp-block-heading\"> Peso molecular do anidrido ac\u00e9tico<\/h3>\n<p> O acetanidrido tem um peso molecular de 102,09 g\/mol. \u00c9 composto por \u00e1tomos de carbono, hidrog\u00eanio e oxig\u00eanio e sua f\u00f3rmula qu\u00edmica \u00e9 C4H6O3. O acetanidrido \u00e9 um produto qu\u00edmico altamente reativo e \u00e9 usado na s\u00edntese de v\u00e1rios produtos qu\u00edmicos, incluindo aspirina e acetato de celulose. Tamb\u00e9m \u00e9 utilizado na produ\u00e7\u00e3o de corantes, tintas e perfumes.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td> <strong>Apar\u00eancia<\/strong><\/td>\n<td> L\u00edquido l\u00edmpido e incolor<\/td>\n<\/tr>\n<tr>\n<td> <strong>Gravidade Espec\u00edfica<\/strong><\/td>\n<td> 1,08g\/cm3<\/td>\n<\/tr>\n<tr>\n<td> <strong>Cor<\/strong><\/td>\n<td> Claro<\/td>\n<\/tr>\n<tr>\n<td> <strong>Cheiro<\/strong><\/td>\n<td> Odor forte e pungente, semelhante ao \u00e1cido ac\u00e9tico<\/td>\n<\/tr>\n<tr>\n<td> <strong>Massa molar<\/strong><\/td>\n<td> 102,09 g\/mol<\/td>\n<\/tr>\n<tr>\n<td> <strong>Densidade<\/strong><\/td>\n<td> 1,08g\/cm3<\/td>\n<\/tr>\n<tr>\n<td> <strong>Ponto de fus\u00e3o<\/strong><\/td>\n<td> -73,1\u00baC<\/td>\n<\/tr>\n<tr>\n<td> <strong>Ponto de ebuli\u00e7\u00e3o<\/strong><\/td>\n<td> 138,4\u00b0C<\/td>\n<\/tr>\n<tr>\n<td> <strong>Ponto flash<\/strong><\/td>\n<td> -20\u00baC<\/td>\n<\/tr>\n<tr>\n<td> <strong>Solubilidade em \u00c1gua<\/strong><\/td>\n<td> Reage com \u00e1gua para formar \u00e1cido ac\u00e9tico<\/td>\n<\/tr>\n<tr>\n<td> <strong>Solubilidade<\/strong><\/td>\n<td> Sol\u00favel em etanol, \u00e9ter e clorof\u00f3rmio<\/td>\n<\/tr>\n<tr>\n<td> <strong>Press\u00e3o de vapor<\/strong><\/td>\n<td> 76 mmHg a 20\u00b0C<\/td>\n<\/tr>\n<tr>\n<td> <strong>Densidade do vapor<\/strong><\/td>\n<td> 2,1 (ar = 1)<\/td>\n<\/tr>\n<tr>\n<td> <strong>PKa<\/strong><\/td>\n<td> 4,76<\/td>\n<\/tr>\n<tr>\n<td> <strong>PH<\/strong><\/td>\n<td> Neutro<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\"> <strong>Seguran\u00e7a e perigos do anidrido ac\u00e9tico<\/strong><\/h2>\n<p> O anidrido etan\u00f3ico \u00e9 um produto qu\u00edmico altamente reativo e inflam\u00e1vel que deve ser manuseado com extremo cuidado. Pode causar irrita\u00e7\u00e3o grave na pele e nos olhos e tamb\u00e9m causar problemas respirat\u00f3rios se inalado. Equipamento de prote\u00e7\u00e3o individual adequado, como luvas e \u00f3culos de prote\u00e7\u00e3o, deve ser usado ao manusear o acetanidrido. Deve ser armazenado em local fresco e seco, longe de fontes de calor e materiais incompat\u00edveis. Em caso de derramamento ou exposi\u00e7\u00e3o, deve-se procurar imediatamente evacua\u00e7\u00e3o e assist\u00eancia profissional.<\/p>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td> <strong>S\u00edmbolos de perigo<\/strong><\/td>\n<td> Corrosivo<\/td>\n<\/tr>\n<tr>\n<td> <strong>Descri\u00e7\u00e3o de seguran\u00e7a<\/strong><\/td>\n<td> O anidrido ac\u00e9tico \u00e9 um \u00e1cido forte e material corrosivo que pode causar queimaduras graves e danos aos olhos e \u00e0 pele. Tamb\u00e9m \u00e9 inflam\u00e1vel e reativo com \u00e1gua.<\/td>\n<\/tr>\n<tr>\n<td> <strong>N\u00fameros de identifica\u00e7\u00e3o da ONU<\/strong><\/td>\n<td> Um 1689<\/td>\n<\/tr>\n<tr>\n<td> <strong>C\u00f3digo SH<\/strong><\/td>\n<td> 2915 2400<\/td>\n<\/tr>\n<tr>\n<td> <strong>Classe de perigo<\/strong><\/td>\n<td> 8<\/td>\n<\/tr>\n<tr>\n<td> <strong>Grupo de embalagem<\/strong><\/td>\n<td> II<\/td>\n<\/tr>\n<tr>\n<td> <strong>Toxicidade<\/strong><\/td>\n<td> Alto<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2 class=\"wp-block-heading\"> <strong>M\u00e9todos para preparar anidrido ac\u00e9tico<\/strong><\/h2>\n<p> O acetanidrido pode ser preparado fazendo reagir o \u00e1cido ac\u00e9tico com um excesso de um composto contendo oxig\u00eanio, como per\u00f3xido ou halog\u00eanio. Um m\u00e9todo comum \u00e9 oxidar o \u00e1cido ac\u00e9tico com um catalisador de pal\u00e1dio ou platina. Esta rea\u00e7\u00e3o pode ser realizada na presen\u00e7a de \u00e1gua, que \u00e9 ent\u00e3o removida por destila\u00e7\u00e3o. Outro m\u00e9todo \u00e9 a rea\u00e7\u00e3o do \u00e1cido ac\u00e9tico com um anidrido, como fosg\u00eanio ou anidrido sulf\u00farico. O produto resultante \u00e9 o acetanidreto, que \u00e9 ent\u00e3o purificado por destila\u00e7\u00e3o. Ambos os m\u00e9todos requerem precau\u00e7\u00f5es de seguran\u00e7a rigorosas porque o anidrido etan\u00f3lico \u00e9 uma subst\u00e2ncia altamente reativa e inflam\u00e1vel.<\/p>\n<h2 class=\"wp-block-heading\"> <strong>Usos do anidrido ac\u00e9tico<\/strong><\/h2>\n<p> O anidrido etan\u00f3ico \u00e9 um reagente qu\u00edmico utilizado em diversas aplica\u00e7\u00f5es industriais e laboratoriais. \u00c9 utilizado principalmente como reagente em s\u00edntese org\u00e2nica, principalmente na produ\u00e7\u00e3o de compostos acetilados como aspirina e acetato de celulose. Tamb\u00e9m \u00e9 utilizado na produ\u00e7\u00e3o de corantes e pigmentos, bem como na s\u00edntese de pesticidas e outros produtos qu\u00edmicos agr\u00edcolas. O acetanidreto tamb\u00e9m \u00e9 utilizado na produ\u00e7\u00e3o de pl\u00e1sticos e outros materiais polim\u00e9ricos, bem como na purifica\u00e7\u00e3o de certos compostos qu\u00edmicos. Tamb\u00e9m \u00e9 utilizado na produ\u00e7\u00e3o de certos tipos de combust\u00edvel e na fabrica\u00e7\u00e3o de certos tipos de borracha.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O anidrido ac\u00e9tico \u00e9 um composto org\u00e2nico l\u00edquido incolor e de cheiro pungente usado em s\u00edntese org\u00e2nica, produ\u00e7\u00e3o de acetato de celulose e fabrica\u00e7\u00e3o de aspirina. Nome IUPAC Anidrido etan\u00f3ico F\u00f3rmula molecular C4H6O3 Identifica\u00e7\u00e3o CAS 108-24-7 Sin\u00f4nimos \u00d3xido ac\u00e9tico, anidrido de \u00f3xido ac\u00e9tico, acetanidrido, anidrido de \u00e1cido ac\u00e9tico, acetato de acetila, anidrido de acetila, anidrido &#8230; <a title=\"Anidrido ac\u00e9tico \u2013 c4h6o3, 108-24-7\" class=\"read-more\" href=\"https:\/\/chemuza.org\/pt\/anidrido-acetico\/\" aria-label=\"Mais em Anidrido ac\u00e9tico \u2013 c4h6o3, 108-24-7\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-353","post","type-post","status-publish","format-standard","hentry","category-produtos-quimicos"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Anidrido ac\u00e9tico - C4H6O3, 108-24-7<\/title>\n<meta name=\"description\" content=\"O anidrido ac\u00e9tico \u00e9 um composto org\u00e2nico l\u00edquido incolor e de cheiro pungente usado na s\u00edntese org\u00e2nica e na produ\u00e7\u00e3o de acetato de celulose.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/chemuza.org\/pt\/anidrido-acetico\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Anidrido ac\u00e9tico - 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