Download PDF, EPUB, MOBI Qualitative Chemical Analysis and Laboratory Practice, by T.E. Thorpe and M.M.P. Muir

Qualitative Chemical Analysis and Laboratory Practice, by T.E. Thorpe and M.M.P. Muir. Thomas Edward Thorpe

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Author: Thomas Edward Thorpe
Number of Pages: 68 pages
Published Date: 13 Sep 2013
Publisher: Rarebooksclub.com
Publication Country: United States
Language: English
ISBN: 9781230184821
File size: 33 Mb
Download Link: Qualitative Chemical Analysis and Laboratory Practice, by T.E. Thorpe and M.M.P. Muir
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 edition. Excerpt: ...forms, it is collected on a very small filter, . and tested as directed on p. 120. 2. Wet Reactions. (a) Ammonia produces a white precipitate of aluminic hydrate, Al(H0)3. (b) Ammonium sulphide produces the same precipitate. (c) Caustic soda or potash throws down the same precipitate; it is soluble in an excess of the reagent, but reprecipitated by ammonium chloride. (d) Barium carbonate also precipitates aluminic hydrate mixed with basic salt. III. Chromium.--Potassium bichromate is used for the tests. 1. Dry Reactions.--Heated on platinum foil with potassium nitrate, a yellow mass of potassium chromate (K2Cr04), soluble in water, is formed. On borax bead in oxidising and reducing flames, gives a green coloured bead. 2. Wet Reactions.--Dissolve a few crystals of potassium bichromate in water, add a little hydrochloric acid and alcohol, and boil until the liquid is dark green in colour. This solution now contains chromium chloride: K2Cr207 + 8HCI + 3C2H60 = Cr2Cl6 + 2KCI + 3C2H40 + 7H20 (a) Ammonia precipitates greyish-green chromic hydrate, Cr(0H)3. (b) Caustic soda or potash produces the same precipitate. It is soluble in an excess of the precipitant, but is reprecipitated on boiling for a few minutes. Chromium in certain compounds (the chromates) plays a chlorous rather than a basylous part. Its presence in such substances may be detected as follows. Using as example a solution of potassium dichromate in water. (a) Ammonium sulphide throws down a brown precipitate consisting chiefly of chromium chromate, Cra(Cr04)3, the solution now containing potassium chromate, thus--S(KaCra07) + 3(NH4)aS = Cra(Cr04)3 + S3 + 5KaCr04 + 6NH3 + 3H.O. If ammonium sulphide be added in excess and the liquid boiled, green chromic hydrate, Cr(0H)3, mixed with..

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