Notes on analytical chemistry : for students in medicine / by Albert J. Bernays.
- Albert Bernays
- Date:
- 1886
Licence: Public Domain Mark
Credit: Notes on analytical chemistry : for students in medicine / by Albert J. Bernays. Source: Wellcome Collection.
19/160 page 9
![GRorr YI.—SoDivM Cahboxate no Puecii'itate. Calcium car bonate, CaCOj, white. Calcium snlphate, of course no precipitate. Ammonium oxalate, an immediate ]u-ecipitate of calcium oxalate, insoluble in acetic acid. Ammonia, no reaction. Yellow-red colour to flame. Inasnuicli as Division-test A has given a white precipitate, although ammonium carbonate in presence of the chloride of ammonium has given no precipitate, magnesium must be present in form of a salt of uiagnesium. Magnesium carhomdt, MgCOy, white, by sodium carbonate. Ammonia, white precipitate of magnesium hydroxide MgHgOi. Annnonium chloride first added to a further portion, then NH^OH, and sodium phosphate, a white crystalline precipitate of magncsium- amnioniTmi-phosphate. The chief soluble salts of barium and strontium are the chloride, and the nitrate; of calcium and magnesium, the chloride, sulphate, and nitrate. Ba. Sr. Ca. Mg. DIVISION B. Sodium carbonate produces no precipitate. Group VI. Boil a small portion of the original solution with sodium carbonate:— AmmniHtim, (NH.,),,, is recognised as ammonium carbonate, NHiHCOa, by the odour of hartshorn, by the bluing of red litmus held in tiie tube, and by the white fumes of ammonium chloride, when a glass rod, dipped into hydrochloric acid, is held in the vapours. Salts colourless and volatile. Platinic chloride, PtCl4, to fresh por^tion : yellow precipitate of ammonium platinic chloride 2NH,C1, PtCl,. If ammonium not present, look for potassium and sodium. Fotasdum salt, on a loop of platinum wire, a violet colour to flame, made red by viewing through blue glass. Platinic chloride, a yellow precipitate of potassium platinic cldoride 2KC1, PtCl^. Sodium salt, on a loop of platinum wire, bright yellow colour to flame. No precipitate with PtCl^. Ammonium, as hydrate, NH4OH, strongly alkaline, smells of harts- liorn, fumes on addition of HCl. AgNOg, grey-brown precipitate, very soluble in free ammonia, and in nitric aci(l. Potassium, as hydroxide, KOH, strongly alkaline; no reaction with Na.COg; evolves NH., from ammonium chloride on heating. Pre- cipitates grey-l)rown AgOlI, soluble in ammonia, and in nitric acid. Confirmed by flame-test, and by platinic chloride. Sodium, as hydroxide, NaOH, like KOH, but yellow color to flame, and no reaction with platinic chloride, PtCl^.](https://iiif.wellcomecollection.org/image/b21499056_0019.jp2/full/800%2C/0/default.jpg)
