Chem 142 Lab 2

Chemical Composition of Compounds

The 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 porcelin 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 determine the following:

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 66 KB, rev 10/17/07)
  • WebAssign
  • Review Materials & Procedure
  • Review Demonstration
• In Lab
  • Materials & Procedure (pdf 44 KB, rev 10/4/07)
  • Demonstration
• Post Lab
  • Explanation
  • Report Template (xls 72 KB, rev 4/15/08)