A:When stongly heated,it assumes a yellow color that disappears on cooling B:Asolution of it in a slight excess of 3N hydrochloric acid responds to the tests for Zinc<191>
Alkalinity
Mix 1.0g with 10ml of hot water,add 2 drops of phenolphthalein TS,and filter;if a red color is produced.not more than 0.30ml of 0.10 N hydrochloric acid is required to discharge it Loss on ignition: not more than 1.0%
As
not more than 6ppm
color of solution
Mix 2.0g with 10ml of water,add 30ml of 2N sulfuric acid,and heat on a steam bath,with contant stirring;no effervescence occoursand the resulting solution is clear and colorless
Lead(Pb)
Add 2g to 20ml of water,stir well,add 5ml of glacial acetic acid,and warm on a steam bath until solution is effected,the addition of 5 drops of potassium chromate TS produces no trubidity or precipitate Iron and other
heavy metals
Cooled 5ml portions of the solution obtained in the test for Carbonate and color of solution yield white precipitates with potassium ferrocyanide TS and with sodium sulfide TS
