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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    ■11) neutralizing Nvith KOH. Ne-.trulizo. ^vitU NH OH no p cc^ with CaCL until heated. H,SO. rculily evolves CO ^vitli b t sli.>-|,t ehau-e of color. Thi.s it,.s beliavioiir, ino.t like oKuUe aefd : only on Ion- boiling darkens. AgNO, no leaction excep iu eitrate;: then white pr. PbiC.H^O.,, white, amorphous, lively .soluble iu ammonia. On platinum 1 u.ses, carbonizes; tunios jiuii-ent. CiTiiATES, with carbonization, mto carbonates, oi oxides, or nielal. ,-,-,t -n rk^i; Malic acid C.,H3(0H)^C00H), = 0,II„0 Pa^e 36- De ' quescent, indistinctly crystalline. Very acid. Etiervesccs with X-x CO Fehrlc chloride no reaction. Lime-water im reaction' CaSO, no reaction. CaCL, none, even after saturation with KOH or NH^OH, but upon boiling. H.,SO„ gases CO and CO evolved, with almost immediate browning and blackening (resembles tartaric acid). AgNO, no reaction except 111 malates. Pb-C.H,0„, white malate, somewhat soluble m malic acid, spa- rin<^lv in'ammonia. Heated carefully iu a test-tube, by heat into volatile maleic and fumaric acids. On platinum tuses, and evolves pungent, acid vapors. ., ,. . ^rj].— [n presence 0/ only one of these four acids, Linie-initer serves to disliiiquish. . , , , . Uric acid C,H,N,03. Page 3 3- White powder, lusoluLle in water. Blackens immediately when heated, with odor ot burn hair Solution of potassium urate stroniily alkaline. HCl white precipitate of uric acid. HNO3 as a drop, added to - mere trace of uric acid, and evaporated, a red-brown residu turned purple by ammonia (purpurate of ammonium ' murexid). CaCl^ white calcium urate. a or GRorp D. Includes succinic, benzoic, and htppiric acids. When heated they volatilize : hippuric acid with decomposition. The fumes of benzoic acid are most mitating. The calcium salts are soluble in water. Ferric chloride precipitates succinates, BENZOATES and hippurates, respectively brownish-red, flesh- colored, and brown. Succinic acid C.,H,(COOH), = C,H,0,. Page 37. Colorless, rhombic prisms, very soluble in water and alcohol, volatile wheii heated, leaving little carbon which burns away. Acid to test- paper. Effervesces with Na2C03. Ferric chloride no reaction : but in succinates a brownish-red pr. of ferric succinate, soluble Ln HCl with yellow color. CaCU no reaction : in succinates none till alcohol is added. Pb2C.,H302, white. BaCL no reaction : but on addition of ammonia and alcohol, a white pr., and none with a benzoate. On platinum, burns with blue, sootless flame. Succinates are decomposed by heat into carbonates and carbon, oxides and carbon, or metal. E
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