Sodium chloride(NaCl) The most abundant source of sodium chloride is sea water which contains 2.7-2.9% by mass. Common salt is generally obtained by evaporation of sea water. Crude sodium chloride obtained by crystallisation of brine solution contains impurities of sodium sulphate (Na2SO4) , calcium sulphate (CaSO4 ) , calcium chloride (CaCl2) magnesium chloride … [Read more...] about Baking Soda and Sodium Chloride