Skeleton notes on analytical chemistry : for students in medicine / by Albert J. Bernays.

  • Albert Bernays
Date:
1879
Catalogue details

Licence: Public Domain Mark

Credit: Skeleton notes on analytical chemistry : for students in medicine / by Albert J. Bernays. Source: Wellcome Collection.

    36/88 page 24
    BaSO^: all soluble sulphates precipitate BnSO^. (NH,),0„Oj, white BaC,,0,, soluble in IICl. Na,,HPO, wliite BaIIPO„vory Srliglitly iriciea.se(l by NII.,OH. K.^C\\0, yellow BaCrO,, soluble in HCJl, unless the test contains sulpliate. 2HF,SiF^ almost colorless BaFo.SibV Soluble salts impart greenish-yellow color to flame. Insoluble must be moistened with HCl, and then heated. Barium is estimated as BaSO^ containing 65.66 BaO, insoluble in dilute acids and alkalies. BaClj is insoluble in absolute alcohol: SrCl„ is soluble. 28. Strontium oxide SrO, white. Hydroxide Sr(OH),, white, soluble and alkaline. NajCOj white SrCOj: also precipitated white by the breath. AgNOj, grey-brown Ag^O, soluble in NH3 and in HNO3. Precipitated by CaS04 on heating. Soluble salts (except SrCrO., which is yellow) neutral or faintly acid. Chief salts: Sr2N03,5HoO. SrClj/jH^O, deliquescent. (NH,)„C03, white BaCOj. KOH white SrCOH)^ soluble iu boiling water. NH4OH of course no reaction. CaSO^, white SrSO^ on long standing, or immediate when heated. Soluble sulphates precipitate SrS04. Both Ba and Sr thus removed from solutions containing Ba, Sr, and Ca. (NH4)2C204 white SrCjOj. Carmine color to flame. Strontium weighed as SrSO^ containing 56.52 per cent, of SrO. 29. Calcium oxide CaO, white. Hydroxide Ca(0H)2, white and soluble in 700 ports of cold and 1280 parts of boiling water. ''Lime-water. Alkaline. Precipitated by the breath (CO,), as well as by NaoCOj. AgN03, grey-brown Ag„0, soluble in HNO3 and in NH4OH. Chief salts: CaCU,6H„0, deliquescent. CaS0.|,2H20 soluble in 400 water. Ca2Nb3, 4H2O. CaJClO,. (Chloride of lime 2CaOCl2, dissolves as CaClj + Ca2C10,—therefore two salts, and not given at the examinations.) (NH4)2C03, white CaCOg. The test should l)e added very sparingly on account of the solubility of calcium bi-carbonate, which would be precipitated on boiling. CaSO^ of course no reaction, even on boiling: absence of barium and strontium salts. H2SO4 in concentrated sols., white crystalline CaS04,2H20; precipitate hastened by alcohol. (NH4)oC204 white CaC204, quite insoluble in acetic acid. This test is decisive, if absence of Ba and Sr proved by CaS04. Soluble salts, yellowish-red color to flame. Calcium is weighed as CaCOj, containing 56 per cent, of CaO, or as CaSO^ containing 41.18 of CaO. 30. Magnesium oxide MgO, white. Hydroxide ]Mg(0H)2, alkaline, requiring 5142 parts of ice-cold, and 36,000 parts of boiling water. Cliief salts: MgS04,7H20. MgCl2.6H20. Mg2N03,6H,0. (NH4)2C03, after a few moments, a constantly increasing white precipitate of basic mngnesium cnrbonate. No precipitate in presence of free acids, or of salts of ammonium. NaHCOa. a precipitate on heating: a Mg stilt therefore a test
    digitised image 1
    digitised image 2
    digitised image 3