{"id":3371,"date":"2018-09-26T20:56:26","date_gmt":"2018-09-27T01:56:26","guid":{"rendered":"http:\/\/academia.utp.edu.co\/quimica2\/?p=3371"},"modified":"2018-09-26T20:56:26","modified_gmt":"2018-09-27T01:56:26","slug":"practica-no-16-titulacion-de-un-acido-poliprotico","status":"publish","type":"post","link":"https:\/\/academia.utp.edu.co\/quimica2\/2018\/09\/26\/practica-no-16-titulacion-de-un-acido-poliprotico\/","title":{"rendered":"Pr\u00e1ctica No.16. Titulaci\u00f3n de un \u00e1cido polipr\u00f3tico."},"content":{"rendered":"<p style=\"text-align: center\"><span style=\"font-size: 18pt\"><strong><span style=\"color: #800080\">Pr\u00e1ctica No. 16<\/span><\/strong><\/span><\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 18pt\"><strong><span style=\"color: #800080\"><em>Titulaci\u00f3n de un \u00e1cido polipr\u00f3tico<\/em><\/span><\/strong><\/span><\/p>\n<p><span style=\"font-size: 14pt;color: #993366\"><strong>OBJETIVOS<\/strong><\/span><\/p>\n<ul>\n<li>Verificar y explicar la reacci\u00f3n de una base d\u00e9bil con un \u00e1cido fuerte, teniendo en cuenta &nbsp;curva de titulaci\u00f3n con datos experimentales.<\/li>\n<li>Comparar pH te\u00f3ricos con pH experimentales.<\/li>\n<\/ul>\n<p style=\"text-align: center\"><strong><span style=\"font-size: 18pt;color: #993366\">INTRODUCCI\u00d3N<\/span><\/strong><\/p>\n<p><strong class=\"bold\"><span>Los \u00e1cidos polipr\u00f3ticos<\/span><\/strong><span>&nbsp;son&nbsp;<strong class=\"bold\">\u00e1cidos<\/strong>&nbsp;espec\u00edficos que son capaces de&nbsp;<\/span><em class=\"italic\"><span>perder<\/span><\/em><span>&nbsp;m\u00e1s de un prot\u00f3n por mol\u00e9cula en reacciones \u00e1cido-base.&nbsp;(En otras palabras, \u00e1cidos que tienen m\u00e1s de un&nbsp;\u00e1tomo de&nbsp;H&nbsp;<\/span><sup class=\"superscript\"><span>+<\/span><\/sup><span>&nbsp;ionizable&nbsp;por mol\u00e9cula).&nbsp;Los protones se pierden a trav\u00e9s de varias etapas (una en cada etapa), siendo el primer prot\u00f3n el m\u00e1s r\u00e1pido y el m\u00e1s f\u00e1cil de perder.&nbsp;<\/span><\/p>\n<p><a href=\"https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/\u00c1CIDOS-POLIPROTICOS.png\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-3381 aligncenter\" src=\"https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/\u00c1CIDOS-POLIPROTICOS-300x252.png\" alt=\"\" width=\"373\" height=\"313\" srcset=\"https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/\u00c1CIDOS-POLIPROTICOS-300x252.png 300w, https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/\u00c1CIDOS-POLIPROTICOS-250x210.png 250w, https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/\u00c1CIDOS-POLIPROTICOS.png 746w\" sizes=\"auto, (max-width: 373px) 100vw, 373px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h3 class=\"editable\" style=\"text-align: center\"><span style=\"color: #993366\"><strong>Constante de ionizaci\u00f3n<\/strong><\/span><\/h3>\n<p class=\"paragraph\"><span>Es importante saber que K&nbsp;<\/span><sub class=\"subscript\"><span>1<\/span><\/sub><span>&nbsp;&gt; K&nbsp;<\/span><sub class=\"subscript\"><span>2<\/span><\/sub><span>&nbsp;&gt; K&nbsp;<\/span><sub class=\"subscript\"><span>3<\/span><\/sub><span>&nbsp;, donde K representa la constante de acidez o&nbsp;<\/span><strong class=\"bold\"><span>la constante de ionizaci\u00f3n \u00e1cida<\/span><\/strong><span>(primero, segundo y tercero, respectivamente).&nbsp;Estas constantes se usan para medir el grado de disociaci\u00f3n de hidr\u00f3genos en el \u00e1cido.<\/span><\/p>\n<p>A continuaci\u00f3n se muestra un ejemplo del tema tratado:<\/p>\n<p><a href=\"https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/EJEMPLO-DE-ACIDO-POLIPROTICO.png\"><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\" wp-image-3391 aligncenter\" src=\"https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/EJEMPLO-DE-ACIDO-POLIPROTICO-300x294.png\" alt=\"\" width=\"321\" height=\"315\" srcset=\"https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/EJEMPLO-DE-ACIDO-POLIPROTICO-300x294.png 300w, https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/EJEMPLO-DE-ACIDO-POLIPROTICO-250x245.png 250w, https:\/\/academia.utp.edu.co\/quimica2\/files\/2018\/09\/EJEMPLO-DE-ACIDO-POLIPROTICO.png 739w\" sizes=\"auto, (max-width: 321px) 100vw, 321px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"color: #993366\">Notas:<\/span><\/strong><\/p>\n<p><span>En valoraciones de \u00e1cido fuerte + base fuerte, el pH cambia lentamente al principio, r\u00e1pidamente a trav\u00e9s del punto de equivalencia de pH = 7, y luego vuelve a disminuir.&nbsp;Si se valora en un \u00e1cido fuerte, el pH aumentar\u00e1 a medida que se agregue la base.&nbsp;Por el contrario, si est\u00e1 en una base fuerte, el pH disminuir\u00e1 a medida que se agregue el \u00e1cido.<\/span><\/p>\n<ul>\n<li><span>En titulaciones de \u00e1cido fuerte + base d\u00e9bil, el pH cambia lentamente en el punto de equivalencia y el pH es igual al pK&nbsp;<\/span><sub class=\"subscript\"><span>a<\/span><\/sub><span>&nbsp;del \u00e1cido.&nbsp;El pH est\u00e1 por debajo de 7.<\/span><\/li>\n<li><span>Para el \u00e1cido d\u00e9bil + base fuerte, el pH est\u00e1 por encima de 7 en el punto de equivalencia.<\/span><\/li>\n<li><span>Si queda un \u00e1cido fuerte o una base fuerte despu\u00e9s del punto de equivalencia, se puede usar para encontrar el pH de la soluci\u00f3n.<\/span><\/li>\n<\/ul>\n<p>Tomado de:&nbsp;https:\/\/chem.libretexts.org\/Textbook_Maps\/Physical_and_Theoretical_Chemistry_Textbook_Maps\/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)\/Acids_and_Bases\/Monoprotic_Versus_Polyprotic_Acids_And_Bases\/Polyprotic_Acids_And_Bases<\/p>\n<div class=\"video-container\"><iframe loading=\"lazy\" title=\"Polyprotic Acids\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/--pzKBW13FE?feature=oembed&#038;wmode=opaque\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<div class=\"video-container\"><iframe loading=\"lazy\" title=\"23. Potencial hidrogeno - pH - Sales de \u00e1cido poliproticos debiles | Qu\u00edmica anal\u00edtica\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/aLCeVm4jVG0?feature=oembed&#038;wmode=opaque\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<div class=\"video-container\"><iframe loading=\"lazy\" title=\"Polyprotic Acid Titration Lab\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/gy9eHwPyDpM?feature=oembed&#038;wmode=opaque\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>Simulaci\u00f3n:<\/p>\n<p><a href=\"http:\/\/wps.prenhall.com\/wps\/media\/objects\/4679\/4792059\/ch16_09.htm\">http:\/\/wps.prenhall.com\/wps\/media\/objects\/4679\/4792059\/ch16_09.htm<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pr\u00e1ctica No. 16 Titulaci\u00f3n de un \u00e1cido polipr\u00f3tico OBJETIVOS Verificar y explicar la reacci\u00f3n de una base d\u00e9bil con un \u00e1cido fuerte, teniendo en cuenta &nbsp;curva de titulaci\u00f3n con datos experimentales. Comparar pH te\u00f3ricos&#46;&#46;&#46;<\/p>\n","protected":false},"author":301,"featured_media":3401,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guias-de-laboratorio"],"_links":{"self":[{"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/posts\/3371","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/users\/301"}],"replies":[{"embeddable":true,"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/comments?post=3371"}],"version-history":[{"count":2,"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/posts\/3371\/revisions"}],"predecessor-version":[{"id":3421,"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/posts\/3371\/revisions\/3421"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/media\/3401"}],"wp:attachment":[{"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/media?parent=3371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/categories?post=3371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/academia.utp.edu.co\/quimica2\/wp-json\/wp\/v2\/tags?post=3371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}