{"id":69,"date":"2024-10-24T19:10:58","date_gmt":"2024-10-24T23:10:58","guid":{"rendered":"https:\/\/sites.temple.edu\/chemdemo\/?p=69"},"modified":"2024-10-25T16:22:13","modified_gmt":"2024-10-25T20:22:13","slug":"metal-catalysis","status":"publish","type":"post","link":"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/metal-catalysis\/","title":{"rendered":"Metal Catalysis"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Tartarate Ion and Hydrogen Peroxide Reaction<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Description<\/strong>: A mixture of tartarate ion and hydrogen peroxide does not react, even at 70\u00b0C. Adding <strong>cobalt ions<\/strong> as a catalyst causes the reaction to proceed; the color of the mixture changes from pink to green, accompanied by considerable foam.<\/li>\n\n\n\n<li><strong>Source<\/strong>: Fun with Chemistry: A Guidebook of K-12 Activities; M. and J. Sarquis Volume: 2 Page: 253<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Catalytic Decomposition of Hydrogen Peroxide<\/h2>\n\n\n\n<p><strong>Catalyst Used<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fe(III)<\/strong> is used as a catalyst to decompose hydrogen peroxide (H\u2082O\u2082).<\/li>\n\n\n\n<li>The catalytic role is evident as the color of the catalyst remains unchanged.<\/li>\n\n\n\n<li><strong>MnO\u2082<\/strong> can also be used effectively.<\/li>\n<\/ul>\n\n\n\n<p><strong>Purpose<\/strong><br>To illustrate that catalysts speed up a reaction and are themselves not consumed in the process.<\/p>\n\n\n\n<p><strong>Materials Needed<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MnO\u2082 powder<\/strong><\/li>\n\n\n\n<li><strong>50 mL H\u2082O<\/strong><\/li>\n\n\n\n<li><strong>Dish soap<\/strong><\/li>\n\n\n\n<li><strong>50 mL of 30% H\u2082O\u2082<\/strong><\/li>\n\n\n\n<li><strong>1L graduated cylinder<\/strong><\/li>\n\n\n\n<li><strong>Iron nitrate solution (freshly prepared)<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Procedure<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Preparation<\/strong>: See <a href=\"http:\/\/chemeducator.org\/sbibs\/s0006004\/spapers\/640221tr.htm\">Chem Educator<\/a> for preparation of solutions.<\/li>\n\n\n\n<li><strong>Set Up<\/strong>: In a 1L graduated cylinder, add a spatula full of MnO\u2082.<\/li>\n\n\n\n<li><strong>Add Liquid<\/strong>: Pour a mixture of 50 mL H\u2082O and dish soap on top of the MnO\u2082.<\/li>\n\n\n\n<li><strong>Add H\u2082O\u2082<\/strong>: Carefully pour about 50 mL of 30% H\u2082O\u2082 on top.<\/li>\n\n\n\n<li><strong>Safety Precautions<\/strong>: Wear gloves and emphasize the instability of concentrated H\u2082O\u2082. Write the decomposition reaction on the board.<\/li>\n<\/ol>\n\n\n\n<p><strong>Demonstration Steps<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Show students a bottle of hydrogen peroxide and discuss its common uses, highlighting the difference between the 3% in medicine cabinets and the 30% solution.<\/li>\n\n\n\n<li>Pour some H\u2082O\u2082 into a beaker and place it under a document camera. Ask how they would know if it is degrading (bubbles indicate breakdown).<\/li>\n\n\n\n<li>Prompt students to think about how to make it bubble more vigorously, guiding them to the idea of cuts and blood.<\/li>\n\n\n\n<li>Explain that blood contains <strong>catalase<\/strong>, a catalyst that decomposes H\u2082O\u2082, and that the iron III ion in catalase is essential for this reaction.<\/li>\n\n\n\n<li>Show the iron solution (rust-colored) and add it to the graduated cylinder with MnO\u2082 and H\u2082O\u2082.<\/li>\n\n\n\n<li>Stand back and observe the reaction: it will turn black, bubble, then produce a significant amount of foam and steam.<\/li>\n<\/ul>\n\n\n\n<p><strong>Follow-Up Discussion<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Discuss how to determine the production of oxygen (using a match to test for it).<\/li>\n\n\n\n<li>Reinforce the concept of catalysis by noting that the color of the catalyst remains unchanged, and further hydrogen peroxide can be added for additional reactions.<\/li>\n\n\n\n<li>Caution against using large amounts of hydrogen peroxide after the initial run due to the heat generated during the reaction.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Tartarate Ion and Hydrogen Peroxide Reaction Catalytic Decomposition of Hydrogen Peroxide Catalyst Used PurposeTo illustrate that catalysts speed up a reaction and are themselves not&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/metal-catalysis\/\">Continue Reading<span class=\"screen-reader-text\">Metal Catalysis<\/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-69","post","type-post","status-publish","format-standard","hentry","category-demonstrations","entry"],"_links":{"self":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/69","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=69"}],"version-history":[{"count":2,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/69\/revisions"}],"predecessor-version":[{"id":77,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/69\/revisions\/77"}],"wp:attachment":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/media?parent=69"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/categories?post=69"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/tags?post=69"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}