{"id":100,"date":"2024-10-24T21:03:58","date_gmt":"2024-10-25T01:03:58","guid":{"rendered":"https:\/\/sites.temple.edu\/chemdemo\/?p=100"},"modified":"2024-10-25T16:22:01","modified_gmt":"2024-10-25T20:22:01","slug":"iodine-oxidation","status":"publish","type":"post","link":"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/iodine-oxidation\/","title":{"rendered":"Iodine Oxidation"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Materials Needed<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1 M solution of KI (potassium iodide) or NaI (sodium iodide)<\/li>\n\n\n\n<li>H cell (U-tube)<\/li>\n\n\n\n<li>Zinc electrode<\/li>\n\n\n\n<li>Carbon electrode<\/li>\n\n\n\n<li>Phenolphthalein indicator<\/li>\n\n\n\n<li>2% starch solution<\/li>\n\n\n\n<li>Power supply<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Procedure<\/h2>\n\n\n\n<p><strong>Setup<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Place the 1 M KI or NaI solution into both sides of the H cell.<\/li>\n\n\n\n<li>Add phenolphthalein and 2% starch solution to both sides of the H tube.<\/li>\n<\/ul>\n\n\n\n<p><strong>Electrode Connection<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Attach the zinc and carbon electrodes to the respective sides of the H cell.<\/li>\n<\/ul>\n\n\n\n<p><strong>Current Activation<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turn on the power supply to initiate the current flow.<\/li>\n<\/ul>\n\n\n\n<p><strong>Observation<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Observe the formation of a pink color at the cathode and a purple color at the anode.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Chemical Reactions<\/h2>\n\n\n\n<p>The following reactions occur during the demonstration:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Half Reaction<\/strong><\/th><th><strong>Type<\/strong><\/th><th><strong>Equation<\/strong><\/th><\/tr><\/thead><tbody><tr><td>2 H2O(l) + 2e\u2212 \u2192 H2(g) + 2 OH\u2212(aq)<\/td><td>Cathode (reduction)<\/td><td>2 H2O(l) + 2e\u2212 \u2192 H2(g) + 2 OH\u2212(aq)<\/td><\/tr><tr><td>2 I\u2212(aq) \u2192 I2(l) + 2 e\u2212<\/td><td>Anode (oxidation)<\/td><td>2 I\u2212(aq) \u2192 I2(l) + 2 e\u2212<\/td><\/tr><tr><td>2 I\u2212(aq) + 2 H2O(l) \u2192 H2(g) + 2 OH\u2212(aq) + I2(l)<\/td><td>Overall reaction<\/td><td>2 I\u2212(aq) + 2 H2O(l) \u2192 H2(g) + 2 OH\u2212(aq) + I2(l)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>This demonstration illustrates the oxidation of iodide and highlights the roles of the cathode and anode in a galvanic cell. The color changes serve as visual indicators of the reactions occurring at each electrode.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Materials Needed Procedure Setup: Electrode Connection: Current Activation: Observation: Chemical Reactions The following reactions occur during the demonstration: Half Reaction Type Equation 2 H2O(l) +&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/iodine-oxidation\/\">Continue Reading<span class=\"screen-reader-text\">Iodine Oxidation<\/span><\/a><\/div>\n","protected":false},"author":36673,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-100","post","type-post","status-publish","format-standard","hentry","category-demonstrations","entry"],"_links":{"self":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/100","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/users\/36673"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/comments?post=100"}],"version-history":[{"count":1,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/100\/revisions"}],"predecessor-version":[{"id":101,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/100\/revisions\/101"}],"wp:attachment":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/media?parent=100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/categories?post=100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/tags?post=100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}