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One other chemical produced in Jurong Island is the chemical Chlorine. As an element, it has an atomic number of 17 and is known as Cl, existing as a pale green gas which has a suffocating odour that is poisonous. As the chloride ion Cl-, it is abundant in nature and necessary to most form of life. In nature, chlorine is found mainly as the chloride ion, either deposited in the earth or dissolved in the oceans. Since most chloride salts are soluble in water, chloride-containing minerals are usually only found in abundance in dry climates or deep underground. Common chloride minerals include halite (sodium chloride) and sylvite (potassium chloride).

In industrial work, the chlorine element is usually produced by the electrolysis of sodium chlorine dissolved in water (brine). This reaction also results in the production of sodium hydroxide (caustic soda) and hydrogen gas, as seen in the equation: 2NaCl + 2H2O → Cl2 + H2 + 2NaOH


Extraction of chlorine uses of chlorine