# Extraction of Copper

## Extraction of Copper

• Submitted By: anirish
• Date Submitted: 12/24/2013 12:05 AM
• Category: Science
• Words: 440
• Page: 2
• Views: 47

Research question/Aim

Extract copper from copper oxide by reduction using butane gas

Hypothesis

The butane gas will reduce the copper oxide and leave behind pure copper. This will allow us to find the empirical formula of the copper oxide as well as the masses of oxygen and copper

Variables

Dependant variable

The dependant variable will be the reduction of the copper oxide which will be calculated at different temperatures.

Independent variable

The independent variable here would be the temperature at which the copper oxide is heated.

Controlled variables

The mass of copper oxide used in the test tube

The mass of the test tube

Apparatus
1 test tube with a small opening towards the bottom
1 Bunsen burner
1 Electric Balance
Safety goggles
Constant supply of butane gas
5 grams of the copper oxide
Heat proof mat
Rubber bung
Tube connecting test tube to gas supply
Retort stand

Procedure

Weigh the test tube and record its mass

Add 0.8 grams of copper oxide to the test tube and weigh it and record its mass

Attach a tube connecting the test tube to the gas supply using a rubber bung to prevent the gas from escaping

Suspend the tube using a retort stand

Turn on gas supply into the test tube

Light the small opening at the end of the tube to prevent butane gas from escaping

Place the bunsen burner on the heat proof mat and light it. Place it under the test tube

Record any color changes to the copper oxide

After 7 minutes, turn off the burner and measure the mass of the tube and record it

Repeat until mass of the test tube remains constant after heating

Mass of test tube: 28.10g
Mass of test tube + copper oxide: 28.90g

Observations:

First heating: color of copper oxide turns from black to dark brown to reddish brown
Second heating: color of copper oxide turns from reddish brown to lighter brown

Mass after trial 1: 28.83g
Mass after trial 2: 28.83g
Mass after trial 3: 28.83g...