Tests on the Halogens

Fluorine is a very reactive gas and attacks most containers and is excluded from these tests. 

2 g permanganate, add 2 cm conc.HCl, warm and expose to any gas a moist blue litmus paper and a Kl/starch paper. 

Repeat (a) passing the gas through a little water and then add KI solution and shake with a little chloroform. 

Test the solubility of iodine separately in water, ethanol and carbon tetrachloride. 

Only HOCI and its anions are sufficiently stable HOBr and HOI and their anions rapidly disproportionate. NaOCl is known only in solution but solid bleaching powder is the calcium salt. 

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