Question
Sea is the greatest source of some halogens. Comment.
Solution
See water contains chlorides, bromides and iodides of sodium, protassium, magnesium and calcium, but is mainly sodium chloride solution (2.5 % by mass). The deposits of dried up seas contain these compounds e.g. sodium chloride and camalite. KCl MgCl2, 6H2O, certain forms of marine life contain iodine in their various systems. Various sea weeds, for example (Laminaria Species) contain upto 0.5% of iodine and Chile saltpetre contans upto 0.2% of sodium iodate.
