{"id":650,"date":"2020-03-20T10:30:47","date_gmt":"2020-03-20T10:30:47","guid":{"rendered":"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/?p=650"},"modified":"2020-03-20T10:59:26","modified_gmt":"2020-03-20T10:59:26","slug":"pluja-dor","status":"publish","type":"post","link":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/2020\/03\/20\/pluja-dor\/","title":{"rendered":"Pluja d&#8217;or"},"content":{"rendered":"\n<p>A la situaci\u00f3 403.STATU\u00a0QUO\u00a0vam fer\u00a0qu\u00edmica amb l&#8217;Amparo. Vam fer dos\u00a0experiments. Un \u00e9s el de la pluja\u00a0\u00e0cida, que consistia\u00a0a\u00a0observar la formaci\u00f3 de dos s\u00f2lids diferents amb la mateixa composici\u00f3 a partir d&#8217;una reacci\u00f3 de precipitaci\u00f3. A continuaci\u00f3 us deixo la\u00a0mem\u00f2ria.<\/p>\n\n\n\n<ol><li><strong>Objectiu<\/strong><\/li><\/ol>\n\n\n\n<p>Visualitzar o reproduir una reacci\u00f3 de precipitaci\u00f3 r\u00e0pidament i lentament i observar les caracter\u00edstiques del s\u00f2lid format.<\/p>\n\n\n\n<ol start=\"2\"><li><strong>Materials i productes<\/strong><\/li><\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>MATERIALS<\/td><td>PRODUCTES<\/td><\/tr><tr><td>vas de precipitats<\/td><td>Nitrat de plom (II) (Pb(NO3)2)<\/td><\/tr><tr><td>matr\u00e0s aforat<\/td><td>Iodur de potassi (KI)<\/td><\/tr><tr><td>tub d&#8217;assaig<\/td><td>Aigua destil\u00b7lada (H2O)<\/td><\/tr><tr><td>proveta<\/td><td><\/td><\/tr><tr><td>embut de vidre<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ol start=\"3\"><li><strong>Procediment<\/strong><\/li><\/ol>\n\n\n\n<ol><li>Primer de tot he preparat sobre el vas de precipitats o el matr\u00e0s les seg\u00fcents dissolucions:<ol><li>Dissoluci\u00f3 en aigua de 20 ml de nitrat de plom amb una concentraci\u00f3 de 10 g\/l.&nbsp;<\/li><\/ol><\/li><\/ol>\n\n\n\n<figure class=\"wp-block-gallery aligncenter columns-1 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"768\" height=\"1024\" src=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-768x1024.jpg\" alt=\"\" data-id=\"652\" data-full-url=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-scaled.jpg\" data-link=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/?attachment_id=652\" class=\"wp-image-652\" srcset=\"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-768x1024.jpg 768w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-225x300.jpg 225w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-1152x1536.jpg 1152w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-1536x2048.jpg 1536w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-973x1297.jpg 973w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-508x677.jpg 508w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0935-1-1-scaled.jpg 1920w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<ol start=\"2\"><li>Dissoluci\u00f3 de 40 ml de iodur de potassi amb una concentraci\u00f3 de 10 g\/l.<\/li><\/ol>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"768\" height=\"1024\" src=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-768x1024.jpg\" alt=\"\" data-id=\"654\" data-full-url=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-scaled.jpg\" data-link=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/?attachment_id=654\" class=\"wp-image-654\" srcset=\"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-768x1024.jpg 768w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-225x300.jpg 225w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-1152x1536.jpg 1152w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-1536x2048.jpg 1536w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-973x1297.jpg 973w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-508x677.jpg 508w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0934-scaled.jpg 1920w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<ol start=\"2\"><li>A continuaci\u00f3 he abocat el&nbsp; iodur de potassi sobre la dissoluci\u00f3 de nitrat de plom que havia preparat anteriorment i he observat com s\u2019ha format un precipitat de color groc.<\/li><\/ol>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"768\" src=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-1024x768.jpg\" alt=\"\" data-id=\"653\" data-full-url=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-scaled.jpg\" data-link=\"http:\/\/institutviladomat.cat\/portfoli\/16naiararos\/?attachment_id=653\" class=\"wp-image-653\" srcset=\"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-1024x768.jpg 1024w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-300x225.jpg 300w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-768x576.jpg 768w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-1536x1152.jpg 1536w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-2048x1536.jpg 2048w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-973x730.jpg 973w, https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-content\/uploads\/sites\/121\/2020\/03\/IMG_0983-508x381.jpg 508w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<ol start=\"3\"><li>Despr\u00e9s he escalfat el vas. He esperat uns 8 minuts fins que el precipitat ha quedat resolt.<\/li><li>Un cop ha quedat resolt he deixat refredar la dissoluci\u00f3 i he pogut observar com s\u2019anava produint la pluja d&#8217;or.<img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/lh3.googleusercontent.com\/1junV4XjrbwjwJ48U6UbR0UEmdKGbUZGalpkPLL0a9jhccc12LhH0ki66Tf1ETr4zX33L_92yAz_WSetDoxAwz2tXUdBu8lcFeviXQnf66BQXuYQStxyxolUK19DEKDnNM-JdP0-\" width=\"221.2360515021459\" height=\"293.3357142857143\"><\/li><li>Per \u00faltim he abocat sobre una proveta i he pogut veure el resultat final.<\/li><\/ol>\n\n\n\n<p><a href=\"https:\/\/drive.google.com\/open?id=1JzTGHDsgFwo2o6W5_bWFPPBNdyTr4o4F\">Video<\/a><\/p>\n\n\n\n<ol start=\"4\"><li><strong>Dades, c\u00e0lculs, imatges, resultats<\/strong><\/li><\/ol>\n\n\n\n<ul><li><strong>Com penses que \u00e9s possible que al reaccionar dos components incolors generin un producte de qualsevol color?<\/strong><\/li><\/ul>\n\n\n\n<p>Perqu\u00e8 generen petits s\u00f2lids amorfs que impedeixen el pas de la llum.<\/p>\n\n\n\n<ul><li><strong>Escriu la reacci\u00f3 qu\u00edmica ajustada que t\u00e9 lloc. \u00c9s una reacci\u00f3 reversible. Qu\u00e8 significa?&nbsp;<\/strong><\/li><\/ul>\n\n\n\n<p>2IK + Pb(NO<sub>3<\/sub>)<sub>2<\/sub> \u2192 PbI<sub>2 <\/sub>|+ 2KNO<sub>3<\/sub><\/p>\n\n\n\n<p>Es diu reacci\u00f3 reversible a la reacci\u00f3 qu\u00edmica en la qual els productes de la reacci\u00f3 tornen a combinar-se per generar els reactius.<\/p>\n\n\n\n<ul><li><strong>La pluja d\u2019or \u00e9s la cristal\u00b7litzaci\u00f3 del iodur de plom (II). En qu\u00e8 consisteix aquest fenomen?<\/strong><\/li><\/ul>\n\n\n\n<p>Consisteix en una reacci\u00f3 a velocitat lenta en la qual els \u00e0toms s\u2019organitzen en una formaci\u00f3 cristal\u00b7lina.<\/p>\n\n\n\n<ol start=\"5\"><li><strong>Conclusi\u00f3 final<\/strong><\/li><\/ol>\n\n\n\n<p>Com hem pogut veure en aquest experiment la mescla \u00e9s homog\u00e8nia entre les dues sals, i dona com a resultat el PbI2. El PbI2 \u00e9s insoluble a temperatures baixes i temperatures no massa elevades, per\u00f2 a temperatures altes \u00e9s soluble. Quan el compost es refreda es torna a formar el precipitat per\u00f2 formant petits cristalls brillants.<\/p>\n\n\n\n<p>En aquest experiment hem apr\u00e8s que \u00e9s una reacci\u00f3 reversible. Tamb\u00e9 he apr\u00e8s que quan els \u00e0toms s&#8217;ordenen en forma geom\u00e8trica brillen i \u00e9s quan es produeix la cristal\u00b7litzaci\u00f3 (aix\u00f2 es produeix que una reacci\u00f3 \u00e9s lenta llavors els \u00e0toms tenen temps a ordenar-se).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A la situaci\u00f3 403.STATU\u00a0QUO\u00a0vam fer\u00a0qu\u00edmica amb l&#8217;Amparo. Vam fer dos\u00a0experiments. Un \u00e9s el de la pluja\u00a0\u00e0cida, que consistia\u00a0a\u00a0observar la formaci\u00f3 de dos s\u00f2lids diferents amb la mateixa composici\u00f3&#8230;<\/p>\n","protected":false},"author":123,"featured_media":655,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[83],"_links":{"self":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/posts\/650"}],"collection":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/users\/123"}],"replies":[{"embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/comments?post=650"}],"version-history":[{"count":2,"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/posts\/650\/revisions"}],"predecessor-version":[{"id":664,"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/posts\/650\/revisions\/664"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/media\/655"}],"wp:attachment":[{"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/media?parent=650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/categories?post=650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/institutviladomat.cat\/portfoli\/16naiararos\/wp-json\/wp\/v2\/tags?post=650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}