Alternative to Practical - Question 4

4 An iron key is electroplated with copper metal using the apparatus shown in Fig. 4.1.

Fig. 4.1

When the switch is closed, the copper dissolves from the anode, moves through the aqueous copper sulfate and coats (plates) onto the key at the cathode.

Plan an investigation to find the relationship between the number of volts supplied by the batteries and the mass of copper coated onto the key.

You are provided with:

• several 1.5 V batteries
• the apparatus and chemicals shown in Fig. 4.1

You may use any common laboratory apparatus in your plan.

In your plan, include:

• any other apparatus you will need
• a brief description of the method
• the measurements you will make and how you make them as valid as possible
• the variables you will control
• how you will process your results to reach a conclusion