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.

    73/272 (page 55)
    ay) TABU Wa. Baryta (BaO). D 1. Sulphate of lime, (CaO, SO,)in solution, pre- cipitates baryta immedi- ately, from its solutions, in the form of SULPHATE (BaO, SO) insoluble in acids and alkalies. D 2. Chromate of pot- ash (KO, CrO,), in solu- tion, produces, in neutral and alkaliue solutions of baryta, a pale yellow pre- cipitate of CHROMATE OF Baryta (BaQ, Cr Oz), insoluble in the alkalies and acetic acid, soluble in hydrochloric and_ nitric acids. D 3. Sulphuric acid and the soluble sulphates behave in the same man- ner in solutions of baryta as sulphate of lime. D 4. Ovralic acid (HO, C,0; =HO, QO), in solu- tion, produces only in con- centrated solutions of ba- ryta a white precipitate of Oxalate of Baryta (BaO, O), soluble in acids. The addition of ammonia ren- ders this reaction there- fore more susceptible. StRontTrA (Sr QO). E 1. Sulphate of lime, in solution, precipitates strontia after the lapse of some time,* from its solutions, in the form of SutpHaTe (SrO, SO,), almost absolutely insoluble in acids and alkalies. E 2. Chromate of potash, in solution, causes, in concentrated solutions of salts of strontia, a bright yel- low precipitate (Sr O, CrO.), but not in dilute solutions, or such as contain free acetic acid. E 3. Sulphuric acid and the soluble sul- phates precipitate stron- tia completely from its solutions, in the form of SutpHaTE. The pre- cipitate will not appear immediately, unless the solution be very con- centrated. E 4. Oxalic acid, in solution, precipitates, even from dilute solu- tions of strontia, a white precipitate of Oxalate of Strontia. The addi- tion of ammonia pro- motes the formation of the precipitate. Lime (CaO). F 1. Sulphate of lime produces no precipitate in solutions of lime. F 2. Chromate of potash, in solution, pro- duces no precipitate in solutions of lime,CHRO- MATE OF Lime being soluble. F 3. Sulphuric acid and the alkaline sul- phates cause only in concentrated solutions of lime a partial preci- pitate of SULPHATE OF Lime, which redissolves completely in a large amount of water. F 4. Owalic acid, in solution, throws down from neutral solutions of lime, even if highly diluted, a precipitate of Oxalate of Lime. The addition of ammonia renders this reaction more delicate.