Data Bases • Custom Term Papers • Free Term Papers • Free Research Papers • Free Essays • Free Book Reports • Plagiarism? Links • Top 100 Term Paper Sites • Top 25 Essay Sites • Top 50 Essay Sites • Search 97,000 Papers @ DirectEssays.com • Search 101,000 Papers @ ExampleEssays.com • Search 90,000 Papers @ MegaEssays.com Free Essays • Term Paper Sites • Chuck III's Free Essays • Free College Essays • TermPaperSites.com • My Term Papers • Get Free Essays • Essay World • Planet Papers	Search Lots of Essays Back to Subjects - Science Lab ReportDetermination of a Formula by Analysis Lab ReportDetermination of a Formula by Analysis Determination of a Formula by Analysis Determine the percent of Silver and Oxygen in Silver Oxide to determine the empirical formula. Place a clean porcelain crucible without lid onto a wire triangle on a tripod or ring. Heat the crucible for several minutes to a dull red heat using the hottest blue flame that the Bunsen burner will produce. Allow crucible to cool to room temperature then weigh it on an analytical balance to the nearest 0.001g. Handle the crucible only with forceps and carry it in a clean, dry beaker. Cover the crucible with all of the Silver Oxide and weigh precisely again. Heat crucible until there is no further change that can be observed. Repeat the process again until a constant weight is obtained, signifying the reaction is complete. Weight of crucible + silver oxide = 18.178g Weight of empty crucible = 16.884g Weight of silver oxide = 1.294g Weight of AgO + crucible after heating = 18.085g Weight of after second heating = 18.075g Weight of silver = 1.191g Weight of oxygen = 0.103g Take the weight of the silver and divide by the weight of silver oxide and multiply by 100 to find the percent of silver in silver oxide. 1.191gAg/1.294gAgO * 100% = 92.0% of Ag in AgO 0.103gO2/1.294gAgO *100% = 8.0% of O2 in AgO The empirical formula for silver oxide is Ag2O. The balanced equation: 2Ag2O à 4Ag + O2 Do not heat with yellow flame at any time. Why? Because heating with a yellow flame will cause soot to form at the bottom of the crucible. Bibliography: Word Count: 308
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