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.

    44/88 page 32
    green in color. HCl no visible reaction. AgNO, orange, in- soluble in HNO3, but readily in KCN and in NH^. Fe^Clg, only deepens the brown tiw^e. FeSO„ Turnbull'.s blue. Distilled witli H^SO^, they yield CNII. Both the insoluble ferrocyauides and ferricynnides are deconii^osed by boiling with NaOH, into tlie respective oxides, and srduble Na^Cfy or Na.Fcdy. By fusion with KNO3, CO. and N are evolved, and the respective metals obtained as oxides. XI. Sulphocyanides. Chief salts : KCNS and NH.CNS. Slightly alkaline. Colorless. HCl no visible reaction. AgNO, white, soluble in NH3, not in dilute HNO3. ThiCJI-^O,, white, very soluble in acetic acid. CuSO^, black CuCsv„:' in presence of FeSOi or H^SOj, white CuoCsy.. Fe^Cl,, blood-red Fe^Csy^: color destroyed by HgUlj; not by HCl. Zu + H„SO^, evolves HjS and decolorizes. XII. Acetates. Witli HCl, by heat evolve acetic acid (see D. P- 3 7)- XIII. Oxalates (see C. p. 35). XIV. Silicates. Salts of alkaline metals alone soluble, colorless, alkaline. HCl gelatinous 11^8104 deposited. In dilute solutions no visible reaction, as ortiio-silicic acid re- mains dissolved ; on evaporation to dryness, heating, and boiling with dilute HCl, SiO. is left as a white, amorphous, insoluble substance. NHjCl, white H4Si04, with odor of NHj. BaClj, white. AgN03, white. (A dialysed solution is gelati- nized by HCl, and is only faintly acid to test-paper.) [Titanic acid, which resembles SiOj, is separated from SiO; by fusion with KHSO4, and subsequent treatment with water, Si02 remains undissolved.] |_Tungstates of alkalies and magnesia alone soluble. Sols, colorless, alkaline. HCl white gelatinous H0WO4, turning yellow on boiling, and insoluble in excess of HCl, of HNO3 and of H2SO4; soluble in amnionic hydrate. (NH4)oS2 + HCl brown WS3. SnCIj yellow ; HCl and heat blue coloration. BaCl„, •white. AgNOj white. HCl + Zn, blue coloration from reduc- tion. H,_,W04 is lemon-colored, insoluble in water.] [Molybdates of alkalies soluble. Colorless. HCl white M0O3, soluble in excess of HCl, of HNO3 and of H.^SOj. Alka- line salts, yellow color by H2S, and prec. bmwu-black by acids, M0S3, soluble in (NH4)2S2. ' In HCl solution with Zn or Sn, blue, green, black. Solution of molybdate of ammonium dis- solved in HNO3, gives yellow precipitate in neutral or acid phosphate s : a test for phosphates.] XV. Borates. Boracic acid B(0H)3, and borax Na^BjO^, loHoO, the commonest. Salts of alkalies, soluble, colorless, alkaline, fusible. All borates somewhat soluble; easily in acids, and ammonium salts. HCl in concentrated sols, white,
    digitised image 1
    digitised image 2
    digitised image 3