Ferrous acetate 21 ammonium sulphate

Besides Fe-, other reducing agents that may be used in conjunction with H2O2 are aliphatic amines, Na2S203 thiourea, ascorbic acid, glyoxal, sulfuric acid, NaHSOs, sodium nitrite, ferric nitrate, peroxidase, AgNOs, tartaric acid, hydroxylamine, ethylene sulfate, sodium phosphite, formic acid, ferrous ammonium sulphate, acetic acid, ferrous sulphate, and HNO2, etc,... 

Ally I acetate [591-87-7] M 100.1, b 103°, d 0.928, n4 1.40488, nD27 1.4004. Freed from peroxides by standing with crystalline ferrous ammonium sulphate, then washed with 5% NaHCC, followed by saturated CaCl2 soln. Dried with Na2S04 and fractionally distd in an all-glass apparatus. 

Colloidal ferrous arsenate has been obtained 7 in the form of an opalescent jelly by successively treating an aqueous solution of a ferrous salt with ammonium sulphate, acetic acid and an excess of sodium orthoarsenate. The jelly cannot be kept indefinitely, but crystallises after a few weeks. 

To approximately 0-2 g acetomenaphthone add 15 ml of glacial acetic acid and 15 ml of dilute hydrochloric acid and boil under reflux condenser for at least fifteen minutes. Cool, protecting against aerial oxidation, and titrate with 0 05N ceric ammonium sulphate using 01 ml of o-phenanthroline-ferrous complex as indicator. Carry out a blank determination using exactly the same amount of indicator. 1 ml 0-05N = 0-006457 g. 

Weigh 0.1 g of resorcinol into a clean dry beaker and dissolve in 0.5 ml of glacial acetic acid. Add 5 ml of the test solution, mix and add 0.1 g of ammonium ferrous sulphate. Prepare a blank test solution for comparison. A green colour in the test sample, compared with a pale yellow in the blank indicates the presence of nitrogen. 

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