{"id":111,"date":"2024-10-24T21:20:52","date_gmt":"2024-10-25T01:20:52","guid":{"rendered":"https:\/\/sites.temple.edu\/chemdemo\/?p=111"},"modified":"2024-10-25T16:22:01","modified_gmt":"2024-10-25T20:22:01","slug":"flash-paper","status":"publish","type":"post","link":"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/flash-paper\/","title":{"rendered":"Flash Paper"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Materials Needed<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Beaker<\/li>\n\n\n\n<li>Ice bath<\/li>\n\n\n\n<li>Fume hood<\/li>\n\n\n\n<li>Concentrated HNO\u2083 (nitric acid)<\/li>\n\n\n\n<li>Concentrated H\u2082SO\u2084 (sulfuric acid)<\/li>\n\n\n\n<li>Toilet paper (1 square)<\/li>\n\n\n\n<li>Beaker filled with water<\/li>\n\n\n\n<li>Tap water<\/li>\n\n\n\n<li>Hanging apparatus (for drying)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Procedure<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Preparation of Nitrate Mixture:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In a beaker placed in an ice bath, mix concentrated HNO\u2083 and concentrated H\u2082SO\u2084 in a 1:2 ratio.<\/li>\n\n\n\n<li>Allow the mixture to cool.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Immersion of Toilet Paper:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Immerse one square of toilet paper into the cooled acid mixture for 30 seconds.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Neutralization and Rinsing:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Immediately remove the toilet paper and place it in a beaker filled with water.<\/li>\n\n\n\n<li>Let the paper sit in water for about 2 minutes.<\/li>\n\n\n\n<li>Rinse the paper under tap water.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Drying:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hang the rinsed toilet paper to dry completely.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ignition:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Once dry, ignite the flash paper to demonstrate its rapid combustion.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Safety Precautions<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Conduct the experiment in a fume hood to avoid inhaling fumes from the acids.<\/li>\n\n\n\n<li>Wear appropriate personal protective equipment (PPE), including gloves and goggles.<\/li>\n\n\n\n<li>Handle concentrated acids with care to avoid spills and skin contact.<\/li>\n<\/ul>\n\n\n\n<p>This experiment demonstrates the preparation of flash paper, the principles of nitration and combustion.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Flash Paper Alternative Procedure<\/h1>\n\n\n\n<p><strong>Flash Paper<\/strong><br><strong>Demo #<\/strong> Gen.35<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Equipment<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tissue paper<\/li>\n\n\n\n<li>Tongs<\/li>\n\n\n\n<li>Paper towels<\/li>\n\n\n\n<li>250 mL beaker<\/li>\n\n\n\n<li>Ice bath<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Chemicals<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>70 mL of concentrated sulfuric acid<\/li>\n\n\n\n<li>30 mL of concentrated nitric acid<\/li>\n\n\n\n<li>250 mL of 1 M sodium hydrogen carbonate (NaHCO\u2083)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Procedure<\/h2>\n\n\n\n<p><strong>Prepare Acid Mixture:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Place a 250 mL beaker in an ice bath.<\/li>\n\n\n\n<li>Add 70 mL of concentrated sulfuric acid and 30 mL of concentrated nitric acid to the beaker.<\/li>\n<\/ul>\n\n\n\n<p><strong>Prepare Tissue Paper:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cut the tissue paper into approximately 2-inch squares.<\/li>\n<\/ul>\n\n\n\n<p><strong>Immerse in Acid:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Using tongs, immerse each piece of tissue paper in the acid mixture for about one minute.<\/li>\n<\/ul>\n\n\n\n<p><strong>Rinse:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rinse each piece of paper in three successive 500 mL water baths. Use fresh water for each piece.<\/li>\n<\/ul>\n\n\n\n<p><strong>Neutralize:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Immerse each piece of paper in 250 mL of 1 M NaHCO\u2083.<\/li>\n\n\n\n<li>If substantial bubbling occurs, re-rinse in water and neutralize in NaHCO\u2083 again.<\/li>\n<\/ul>\n\n\n\n<p><strong>Dry:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spread the treated paper on paper towels to dry overnight.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Demonstration<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To demonstrate the burning of flash paper, light a candle or Bunsen burner and throw the paper into the flame.<\/li>\n\n\n\n<li><strong>Observation:<\/strong> The flash paper burns very quickly and leaves, at most, a tiny residue of white ash.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Safety Note<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Large amounts of flash paper should not be stored for any length of time.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Materials Needed Procedure Safety Precautions This experiment demonstrates the preparation of flash paper, the principles of nitration and combustion. Flash Paper Alternative Procedure Flash PaperDemo&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/sites.temple.edu\/chemdemo\/2024\/10\/24\/flash-paper\/\">Continue Reading<span class=\"screen-reader-text\">Flash Paper<\/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-111","post","type-post","status-publish","format-standard","hentry","category-demonstrations","entry"],"_links":{"self":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/111","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=111"}],"version-history":[{"count":3,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/111\/revisions"}],"predecessor-version":[{"id":122,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/posts\/111\/revisions\/122"}],"wp:attachment":[{"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/media?parent=111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/categories?post=111"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.temple.edu\/chemdemo\/wp-json\/wp\/v2\/tags?post=111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}