crystalline powder, shining plates, or crystalline fragments. Is stable in
air. Is odourless, and has a sweet taste, becoming mildly astringent.
soluble in water; insoluble in alcohol.
1 in 20 solution has?pH of not less
1 in 10 solution responds to tests for;
Aluminum- Solutions of aluminum
salts yield with 6N ammonium hydroxide a gelatinous, white precipitate that
is insoluble in an excess of 6N ammonium hydroxide. 1N sodium hydroxide or
sodium sulfide TS produces the same precipitate, which dissolves in an excess
of either of these reagents.
Sulfate-Solutions of sulfates
yield with barium chloride TS a white precipitate, which is insoluble in
hydrochloric acid and in nitric acid. Hydrochloric acid produces no
precipitate when added to solutions of sulfates.
weigh 7.5g into a 250mL vol. Flask and fill to volume with water.?Pipet 10mL of solution into a 250mL
beaker, add 25mL 0.05M EDTA, 20mL acetic acid-ammonium acetate buffer
TS.?Heat solution to near boiling for
5 minutes.?Cool, add 50mL alcohol,
2mL dithizone TS.?Titrate with 0.05M
zinc sulfate VS to a rose-pink color.p.90.
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