{"id":1582,"date":"2024-05-07T00:29:07","date_gmt":"2024-05-06T21:29:07","guid":{"rendered":"https:\/\/cedra.academy\/?p=1582"},"modified":"2024-05-23T00:38:40","modified_gmt":"2024-05-22T21:38:40","slug":"dizolvarea-ca-proces-fizico-chimic-fenomene-termice-care-insotesc-dizolvarea-substantelor","status":"publish","type":"post","link":"https:\/\/cedra.academy\/?p=1582","title":{"rendered":"Dizolvarea ca proces fizico-chimic. Fenomene termice care \u00eenso\u021besc dizolvarea substan\u021belor"},"content":{"rendered":"\n<p><strong>Dizolvarea ca proces fizico-chimic<\/strong><br>Dizolvarea este un proces fizico-chimic \u00een care moleculele sau ionii unei substan\u021be (solutul) sunt dispersa\u021bi uniform \u00eentr-o alt\u0103 substan\u021b\u0103 (solventul), form\u00e2nd o solu\u021bie. \u00cen timpul dizolv\u0103rii, interac\u021biunile dintre moleculele solutului \u0219i moleculele solventului joac\u0103 un rol crucial. Aceste interac\u021biuni includ for\u021be de atrac\u021bie \u0219i repulsie care determin\u0103 c\u00e2t de bine se amestec\u0103 cele dou\u0103 substan\u021be. \u00cen general, dizolvarea implic\u0103 trei etape principale: disocierea moleculelor solutului, separarea moleculelor solventului pentru a face loc solutului \u0219i interac\u021biunea solut-solvent.<\/p>\n\n\n\n<p><strong>Interac\u021biunile solut-solvent<\/strong><br>Procesul de dizolvare depinde \u00een mare m\u0103sur\u0103 de natura chimic\u0103 a solutului \u0219i a solventului. Solu\u021biile se formeaz\u0103 mai u\u0219or atunci c\u00e2nd solutul \u0219i solventul au propriet\u0103\u021bi similare, adesea enun\u021bat prin principiul &#8222;asem\u0103n\u0103tor dizolv\u0103 asem\u0103n\u0103tor&#8221;. De exemplu, substan\u021bele polare, cum ar fi s\u0103rurile \u0219i zah\u0103rul, se dizolv\u0103 bine \u00een solven\u021bi polari precum apa, deoarece interac\u021biunile dipol-dipol \u0219i leg\u0103turile de hidrogen faciliteaz\u0103 dizolvarea. Pe de alt\u0103 parte, substan\u021bele nepolare, cum ar fi uleiurile, se dizolv\u0103 mai bine \u00een solven\u021bi nepolari, cum ar fi benzina, datorit\u0103 interac\u021biunilor de tip for\u021be van der Waals.<\/p>\n\n\n\n<p><strong>Fenomene termice asociate dizolv\u0103rii<\/strong><br>Dizolvarea substan\u021belor poate fi \u00eenso\u021bit\u0103 de fenomene termice, rezult\u00e2nd \u00een procese endoterme sau exoterme. \u00centr-un proces endoterm, energia necesar\u0103 pentru a rupe leg\u0103turile \u00een solut \u0219i \u00een solvent este mai mare dec\u00e2t energia eliberat\u0103 \u00een timpul form\u0103rii noilor interac\u021biuni solut-solvent. Acest tip de dizolvare absoarbe c\u0103ldur\u0103 din mediul \u00eenconjur\u0103tor, ceea ce duce la o sc\u0103dere a temperaturii solu\u021biei. Un exemplu comun este dizolvarea nitratului de amoniu \u00een ap\u0103, care este folosit \u00een pachetele de ghea\u021b\u0103 instantanee.<\/p>\n\n\n\n<p><strong>Dizolvarea exoterma<\/strong><br>\u00centr-un proces exoterme, energia eliberat\u0103 \u00een timpul form\u0103rii interac\u021biunilor solut-solvent este mai mare dec\u00e2t energia necesar\u0103 pentru a rupe leg\u0103turile ini\u021biale \u00een solut \u0219i solvent. Aceasta rezult\u0103 \u00een eliberarea de c\u0103ldur\u0103, duc\u00e2nd la o cre\u0219tere a temperaturii solu\u021biei. Un exemplu clasic este dizolvarea hidroxidului de sodiu \u00een ap\u0103, care genereaz\u0103 o cantitate semnificativ\u0103 de c\u0103ldur\u0103, fiind utilizat deseori \u00een aplica\u021bii industriale care necesit\u0103 solu\u021bii alcaline fierbin\u021bi.<\/p>\n\n\n\n<p><strong>Aplicabilitatea fenomenelor termice \u00een practic\u0103<\/strong><br>\u00cen\u021belegerea fenomenelor termice care \u00eenso\u021besc dizolvarea este crucial\u0103 \u00een diverse domenii, de la chimia industrial\u0103 la procesele biologice. De exemplu, \u00een industria alimentar\u0103, fenomenele endoterme \u0219i exoterme sunt exploatate pentru controlul temperaturii \u00een procesele de produc\u021bie \u0219i conservare. \u00cen medicin\u0103, solu\u021biile perfuzabile trebuie adesea preparate la temperaturi specifice pentru a men\u021bine stabilitatea compu\u0219ilor activi. Astfel, cunoa\u0219terea comportamentului termic al solu\u021biilor nu doar explic\u0103 fenomenele observate, dar \u0219i optimizeaz\u0103 procesele tehnologice \u0219i aplicative.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" width=\"257\" height=\"196\" src=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/05\/image.jpeg\" alt=\"Aceast\u0103 imagine are atributul alt gol; numele fi\u0219ierului este 4-DIZOLVAREA.jpg\" class=\"wp-image-1586\" style=\"aspect-ratio:1.3112244897959184;width:840px;height:auto\"\/><\/figure>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-16536af0-3df1-4f15-be30-24119ec2a5dc\" href=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/05\/4-Definitia-dizolvarii.pptx\">PPTX   Dizolvarea ca proces fizico-chimic. Fenomene termice care \u00eenso\u021besc dizolvarea substan\u021belor    <\/a><a href=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/05\/4-Definitia-dizolvarii.pptx\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-16536af0-3df1-4f15-be30-24119ec2a5dc\">Descarc\u0103<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Dizolvarea ca proces fizico-chimicDizolvarea este un proces fizico-chimic \u00een care moleculele sau ionii unei substan\u021be (solutul) sunt dispersa\u021bi uniform \u00eentr-o alt\u0103 substan\u021b\u0103 (solventul), form\u00e2nd o solu\u021bie. \u00cen timpul dizolv\u0103rii, interac\u021biunile [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1583,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,10],"tags":[],"_links":{"self":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/1582"}],"collection":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1582"}],"version-history":[{"count":1,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/1582\/revisions"}],"predecessor-version":[{"id":1587,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/1582\/revisions\/1587"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/media\/1583"}],"wp:attachment":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}