Lab Report

Topics: Copper, Mass, Copper(II) oxide Pages: 2 (392 words) Published: November 2, 2006
Steven Leung
Lab Report

The Empirical Formula of a Copper Oxide
To convert an unknown copper oxide to copper (Cu) metal using natural gas to provide a reducing environment as shown below: Cu O (s) + CH (g) ¨ Cu (s) + Co (g) + H O (g)
From the mass difference between the unknown copper oxide and the Cu metal generated at the completion of the reaction and the molar mass of Cu and oxygen, the empirical formula of the original copper oxide can be calculated.

gCopper oxideh (1.0 g)
Bunsen burner
Large test tube
Ring stand
Clamp (with no rubber on the prongs)
Two hole stopper with inlet and outlet tubes
Rubber tubing

Procedures: (in lab notebook)

Raw data:
The copper oxide changed colors during the experimentation. It began as a black powder and and slowly changed to orange as it was heated. It also changed in texture, clumping together into a hard solid rather than a powder.

Mass Measurements (in grams)
Test tube44.9078
Copper Oxide .997

Calculated Data:
The calculated difference between the test tube containing copper oxide and the test tube after the heating is .164 grams. Test tube with copper oxide45.904
Test tube with copper after burn45.740

Mass Measurements (in grams)

Analysis/interpreting data/results:
The difference betweent the unknown initial copper oxide and the Cu metal that was produced is .164 grams. This would indicate that the original copper oxide contained .164 grams of oxygen and .833 grams of copper in the original .997 gram copper oxide. .164 grams of oxygen is equivalent to about .010 moles. .833 grams of copper is equivalent to about .013 moles.

The data indicates that the same amount of moles of oxygen and copper were present in the original copper oxide. Based on this conclusion, the empirical formula of this copper oxide would be CuO. This is the formula for Cupric Oxide.

The amount of Cupric Oxide used in the experiment...
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