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The most common way to make chlorine is to pass electricity through a saltwater solution and this solution will separate into chlorine, sodium hydroxide (Caustic soda) and hydrogen. (electricity) 2NaCl + 2H2O Cl2 + 2NaOH + H2 (electricity) Salt + Water Chlorine + Caustic soda + Hydrogen The gas is dried, chilled and pressurised, or converted to liquid for storage.
