 We placed a one molar solution of potassium bromide in the YouTube. We placed inert graphite electrodes into this solution. We're going to pass electric current through the system. At the cathode, the potassium ion is not easily reduced, so we reduce the water. As the water is reduced, we'll see hydrogen gas produced. The hydroxide ion that's produced will turn the phenothaline in the solution pink. At the anode, the water can be oxidized or the bromide ion can be oxidized. The bromide ion is more easily oxidized than the water, so we'll see the formation of a reddish-brown solution of bromine.