Products of other enterprises
- BrandZinc Oxide
- Country of manufactureIndia
|Identification||A: When strongly heated.it assumes a yellow colour that disappears on cooling.
B : A solution of it in a slight excess of 3 N hydrochloric acid responds to the test of zinc
|Alkalinity||Mix 1.0 g with 10 ml of hot water, add 2 drops of phenolphthalein TS, and filter:.If a red colour is produced not more than 0.3 ml of 0.1 N hydrochloric acid is require to discharge it.|
|Loss On Ignition||Weigh accurately about 2 g and ignite at 500 C,to constant weight :it loses not more than 1.0 % of its weight.|
|Carbonate and Colour Of Solution||Mix 2.0 gm to 10 ml of water 30 ml of 2 N sulphuric acid, and heat on steam bath with constant stirring: no effervescence occurs and the resulting solution is clear and colourless.|
|Arsenic||Dissolve 2 g in 15 ml of brominated hydrochloric acid AsT and 45 ml of water and remove the excess of bromine with a few drops of stannous chloride solution AsT The resultant solution complies with the limit test for arsenic Appendix 3.9 (6 ppm)|
|Lead||Add 2g to 20 ml water stir well, add 5 ml 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 turbidity or precipate.|
|Iron and other heavy metals||Cooled 5 ml portions of the solution obtained in the test for carbonate and colour of solution yield white precipitates with potassium ferrocyanide TS and with sodium sulphide Ts.|
|Assay||Dissolve 1.5 g of freshly ignited Zinc Oxide accurately weighed, and 2.5 g of ammonium chloride in 50 ml of 1 N sulphuric acid VS with the aid of gentle heat if necessary when solution is complete,add methyl orange TS.and titrate the excess sulphuric acid with 1 N sodium hydroxide Vs each ml of 1 N sulphuric acid equivalent to 40 .69 mg of ZnO.
(Zinc Oxide contents not less than 99.0 % and not more than 100.5 %)
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Zinc Oxide USP