CAUTION: Chlorine is toxic. No breathing it in please.
Today I’ll explain how to extract chlorine gas and hydrogen gas from brine using a process knows as electrolysis. You will need brine, a battery and 2 carbon electrodes (these can be pulled out from pencils). Set up your battery and electrodes and making sure the anode and cathode (that’s the positive and negetive terminals) don’t touch, insert them into a saturated brine solution.
From your cathode(-) you’ll see hydrogen gas bubbling away, and chlorine from the anode(+). Sodium and Hydroxide ions are left beind in the brine solution, which will combine slowly turning your sodium chloride solution into sodium hydroxide. Chlorine might react with the newly formed sodium hydroxide producing a contamination of sodium chlorate.
Equasion for this reaction: 2NaCl + 2H2O => H2 + Cl2 + 2NaOH