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.

    42/88 page 30
    NITRITES. CHLORATES. HYPOCHLORITES. IV. Thiosulphates. Salts of alkalies, of Ca and Sr soluble ; alkaline to test-paper. Na2S203,5H20, the common salt, HCl evolves SO^, and in a few moments a vellow prec. of S Tims •— Na,S,03 + 2UCI = 2NaCl + H,0 + SO, + S. AgNO,, white Ag^boOj, rapidly orange and black: A«:^fifi^ + H^O = ILSO + t^-f- o ^^2-^03. black Hg,S. AgCl readily soluble as NaAgS,03. Bad, white BaS.O,. Na.S^Oj.sH^O fuses on platinum, evolves SO,, burning with yellow flame, with blue and red tints on platinum : at last into Na,SO,. Thioscl- i^HUEic ACID non-existent in separate state. [Hyposulphites, tbe real hydrosulphites. The free acid is a yellow liquid, hyposulphorous acid H,S0„ easily decom- posing with liberation of Sulphur. Salts white or colorless, give immediately black Ag^S, with AgNOj. HCl gives yellow color, and after a time S -|- SO,. They bleach vegetable colors more rapidly than other sulphur-acids.] [Dithionates. Dithionic acid H,S,05, colorless liquid, by concentration into H,SO, + SO,. HCl into H,S04 + SO,. AU salts soluble.] [Trithionates. Teithionic acid HjS.O^. Salts mostly soluble. HCl into H,SO, -|- SO, + S. AgNOg yellow. Hg^iNO, black. Hg2N03 white.] [Tetrathionates. Teteathionjc acid H^S.O. : very unstable. HCl into H,SO, + SO, + S,. Hg,2N03, yellow.] [Pentathionates. PeiNTathionic acid H2SJO6, acid liquid, by HCl into H,SO^ + H2S 28^ 4- 4SO,. Iodine water not de- colorized.] [Sulphocarbonates, analogous to carbonates. Sulphocaebonic ACID H2CS3. HCl, deep-brown oil H,CS3 separates. Boiled with water, the sulpliocarbonates become carbonates.] V. Nitrites. Mostly soluble. Nitrites of K, Na and NH„ alkaline, colorless. HCl evolves nitrous fumes (really NO 4- 0 = NO,) of orange color, HNO3 being found iu solution. AgNOs white AgNO,, black on heating. FeSO^, olive-brown color, and NO, gas ; to rich yellow color on heating. CuSOj, emerald-green solution of CuzNO,. Starch-paste and KI, with acetic acid even, blue iodide of starch. For action of HCl upon nitrates and nitric acid, see XXXVII. VI. Chlorates. All soluble: no precipitate with reagents, except of the distinctive basyl. HCl evolves euchlorine as greeu-yellow gas, coloring the solution yellow-greeu. On pla- tinum, into chlorides ; then, dissolved in water, acidulated with HNO3 and AgNOs added, white, curd-like AgCL soluble in NH3 and insoluble in HNO3. Deflagrate on charcoal. VII. Hypochlorites, Bleachiiig-powder 2CaOCl2, thechief salt: dissolves as mixture of CaCI,-|- Ca2C10. Alkaline also very soluble. Odor of 01,; bkach vegetal colors. HCl gives
    digitised image 1
    digitised image 2
    digitised image 3