Manual of qualitative analysis / by Robert Galloway.

  • Galloway, Robert.
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: Manual of qualitative analysis / by Robert Galloway. Source: Wellcome Collection.

    94/272 (page 76)
    FOURTH GROUP. AnuUMINA, SESQUIOXIDE OF CHROMIUM, SESQUIOXIDE or Iron, ProroxipE oF IRon. The Poospuares or Atumina, Curomrum AND Iron. The Puospuares or THE AtKaLine Earrus. The OxaLatrs or Baryta, Srrontia AND Lrmu.* APPENDIX TO THE GROUP. Tiranto Actp. SESQUIOXIDE oF URANIUM. 186. The members of this group are insoluble in water, but they dissolve readily in the dilute mineral acids; after ignition, however, they dissolve with great difficulty, even in the concentrated mineral acids. 187. The metallic radicals of these oxides decompose water ata red heat, and at common temperatures in con- tact with strong acids. 188. Sulphide of ammonium precipitates the members of this group: it precipitates alumina and sesquioxide of chro- mium as oxides, for sulphide of aluminum and sulphide of chromium cannot be formed in the humid way; they (the ee * The phosphates and oxalates do not engage the attention of the student as he passes through the basic groups ; he has therefore only to deal with the substances given in Table IV. It is not until he has had some practice in examining both for acids and bases that the inso- luble salts which are precipitated along with the oxides of this group are included in the course; the precipitate is then examined according to Table V. The substances in the different appendices do not form a part of the course ; they are, therefore, not included in the tables.