Composition of Compounds - UW Dept. of Chemistry

Chemical Composition of Compounds

Close-up of Lab 2 setup 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 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 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 3/12/09)
- WebAssign
- Review Materials & Procedure
- Review Demonstration
In Lab
- Materials & Procedure (pdf 142 KB, rev 9/28/09)
- Demonstration
Post Lab
- Guidelines and Report Sheet