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.

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    SULrUATES. SELKKATKS. OXAT,ATKR. T ARTIl ATES. .'i) B. Acids, the radicles of which are precipitated by barium chloride or barium nitrate, insoluble inhydrochloric or nitric acids. Includes sulphates, selenates and^silicofluorides. XXYI. Sulphates: all sohilik' exc'iil, llnSO,, SrSO,, niul PbSO^: CaS0„:H„O willi dillifully. Neutral or acid to ti st- paper. BaCl., wlilto BaSO,, insoluble in HCl and in HNO3. CaCL white CaSO,.:H.,0. cxi'opt in CaSO., or viry weak solu- tions of otlicr sulphates. Pb:C,,H30,, white PbSO,. Any in- soluble sulphate on charcoal with NaoCOj, liised, gives a, sulphide causing a brown-black stain of AgoS. when moisieiied, on a clean silver coin. Free sulphuric acid SO.,(OH)„ or H.,SO^. oily liquid, volatile with white pungent fumes : beats with water. Etlervesces with carbonates. Behaves like any other sulpliate towards tests. On evaporation, even quite dilute, chars filter-paper when heated. [Selenates, resendile sulphates. BaCl,, white BaSeO., in- soluble in HCl; boiled, evolves Cl„, and then HoSOj separates red Selenium. The original solution, in blowpipe-tiame, gives odor of horse-radish.] XXYII. Silico-fluorides. Silico-fll-oric acid 2HF,SiF,|, acid. 2KF,SiF^ and BaFo,SiF,, with difficulty in water, in- soluble in alcohol. The rest soluble. BaCl.,, translucent BaF.,, SiF^. KCl pr. 2KF.SiF,. NH,OH separates H.SiO,,. On Platinum, volatilizes : into 2HF + SiF^, therefore etches a glass vessel. Salts heated with H.^S04, corrode glass. C. Acids, the salts of which are precipitated by calcium chloride, soluble in nitric or hydrochloric acids. In addition to I. CAKBON.VTES, III. SULFUITES, IX. FEKKOCYANJDES, XV. BORATES, XVIII. ARSEN.ATES, XXVI. SL'LPHUKIC ACID and SULPHATES, are the following : XIII. Oxalates. Many insoluble, but soluble in HCl or in HNO3. HCl separates C„0„(0Ii)2 in solution : no visible re- action. BaCl, white BaC,,b.p sol. in PICl. CaCl,, white CaCoO^, sol. in HOI, insoluble in acetic acid. AgNOj while Ag.>C.,Oj, sol. in HX03 and in NH3. Even CaSO^ precipitates oxalic acid and oxalates, insoluble m CH3.COOH. On platinum, into car- bonates, oxides or metal, without blackening. Oxalic acid H2C.^O_|,2H„0, very soluble in water, very acid. Na2C03 efler- vescenee. Lime-water (and the other tests) an immediate white pr. of CaC.,0.|, by beat into CaC03 without blackening. H^SO, and heat into H„0, CO, and CO, kindling with blue flame, and without darkening. On Platinum, fuses and decomposes with- out blackening ; vapors white, coruscating, suffocating. XXV. Tartrates. Neutral tartrates of alkalies readilv soluble. KHCiH^Oe and NH,HC,H,0, with difficulty soluble. HCl from K„C4H40o and (]SrHj2C^4H40o, white crystalline
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