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Chem 142 Lab 1

Chemical Composition of Compounds

Close-up of Lab 2 setupThe two main objectives of this experiment are to identify compounds based on their percent metal composition and to identify the percent of a compound in a mixture.


In both Parts I and II, a known mass of sample will be heated in a porcelain crucible using the flame from a Bunsen burner. The mass of the sample before heating, the mass of the cooled product, and information from the balanced chemical reaction will make it possible to answer the following questions:


Part IA: Based on the % magnesium in the product, does heating solid magnesium in air produce magnesium oxide (MgO) or magnesium nitride (Mg3N2)?


Part IB: Based on the % copper in the copper oxide product, was the sample Cu2CO3(OH)2 or Cu3(CO3)2(OH)2?


Part II: Based on the mass of oxygen lost while heating the sample, what is the % KClO3 in the KCl/KClO3 mixture?


  • Prelab
    • Intro (pdf 125 KB, rev 9/26/12)
    • Required Prelab Assignment in Canvas (due Tuesday 7/9 at 12:30 pm)
    • Review Materials & Procedure
    • Review Demonstration




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