(1) take this product 0.25g, 50ml water, heating to melt, cool, and get the solution of 5ml, potassium dichromate solution - dilute hydrochloric acid (4:1) a few drops, which produce orange floc.
(2) for identification (1) solution 1ml, under 50ml water, shake, add a few drops of tannic acid, that is cloudy.
(3) take the goods of about 0.3g, a test tube, add a little Soda Lime, red litmus paper produced gas can make wet blue.
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