Graphite rods make great electrodes since they won’t dissolve in water and will conduct electricity.
You may or may not use all of the solution. Just fill the tub most of the way.
You will need to use a clamp to hold the test tubes in place over the rods.
This limitation on current prohibits the water from being split into hydrogen and oxygen. Vinegar is a weak acid, so it doesn’t fully dissociate when dissolved in water, meaning there are fewer ions to conduct electricity.
Baking soda forms sodium and bicarbonate ions when dissociated.
Use a clamp to hold the test tubes in place over the electrodes.
As the gases collect, they will bubble out of the water around their respective electrodes and be captured in the test tubes. You will notice that water is being displaced at the top of the test tube and replaced by the gases. Take note that the tube covering the cathode displaces twice as much water as the tube covering the anode. This is because there are twice as many hydrogen molecules being formed as oxygen molecules.
