Required practical 8 - alternative method

Question 1

What is the aim of this alternative method

Answer 1

To compare electrode potentials of different metals

Question 2

Step 1

Answer 2

Clean a piece of copper and a piece of the metal using emery paper or fine grade sandpaper

Question 3

Step 2

Answer 3

Degrease the metals using propanone and cotton wool

Question 4

Step 3

Answer 4

Connect the copper to the positive terminal of a voltmeter using a crocodile clip and lead

Question 5

Step 4

Answer 5

Cut a piece of filter paper to roughly the same size as the copper, moisten with 2.0 moldm-3 NaCl solution and place on top of the copper

Question 6

Step 5

Answer 6

Connect another lead to the voltmeter and use a crocodile clip to connect it to the second piece of metal

Question 7

Step 6

Answer 7

Hold the metal against the filter paper and record the voltmeter reading

Question 8

Step 7

Answer 8

Repeat with other metals and compare their electrode potentials