Course of qualitative chemical analysis / by the late Wm. Geo. Valentin.

  • Valentin, W. G.
Date:
1880
Catalogue details

Licence: Public Domain Mark

Credit: Course of qualitative chemical analysis / by the late Wm. Geo. Valentin. Source: Wellcome Collection.

    66/290 page 52
    SEPARATIO^T OF THE METxiLS OF GROUP IIIa BY . Add AmCl in considorablo excess ; heat gently, and then add AmHo drop by of Fe'''.) Filter quickly, and -wash -witb hot water. Eeserve the ammonia- filter. Collect the acid solution in another beaker, and repeat in like produces any precipitate in the filtrate. Mix now the different am- iiOLUTiON.—Pass a cun-cnt of SFo though the solution, and filter off ZnS,. MnS, NiS, CoS. Wash oft’ tlie filter, and redissolve the precipitate in dilute IICl, with the addition of a few small crystals -^^d Nallo in excess, boil, and filter. The Solution may conlain Zn, as ZnNaoo. Add Silo. White ])recipitato of ZnS. The PUECII’ITATE may conlain Mnlloo, C0II03, and Nilloo. Wasli, dissolve in a little dilute HCl; nearly f CIT. neutralize with AmHo ; add excess of ! pass a rapid current of SIIj for several minutes through the solution and filter. I'rcKciirc «f Zn. The SoruTiON contains the manganese as acetate. Add AinCl,AmITo, and Sulphu- retted Hydrogen Water. Flesh - coloured precipitate of MnS. I'rcseiice of Mn. Hesidue.—Dissolve in HCl and { OKo ’ ’^®arly neutralize with COiUaoo ; add a weak solution of IvCy, so ns just to rcdissolve the precipitate first produced. Boil briskly for some time, allow to cool (filter off’ any slight precipitate), and add a xlrong solution of ClNao ; allow to stand for some time in a warm ])lace, as long as a black pre- cipitate forms, and filter. Pkeoipitate con- sists of Niollofi. Filter off and confirm by heat- ing a small por- tion of it on a borax bead be- fore the blow- ifipe flame. A yellowish to sherry-red bead. I'rcseiicc of Tfl. Tlie Solution con- tains the cobalt as KgCojCyio. Evaporate to dryness, and test a little of the residue before the blowpipe flame on a borax bead. A blue bend in both flames. Presence of Co.
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