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Step 1/6
Add 50cm3 of solution to a beaker
Step 2/6
Add the lid and insert electrodes through the hole so they don’t touch
Ste 3/6
Attach crocodile leads to the electrode and connect to a power supply
Step 4/6
Set the power supply to 4V and switch on
Step 5/6
Hold the litmus paper near the positive electrode using forceps
Step 6/6
After a few minutes turn off the power supply and observe the negative electrode