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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    acid salts readily soluble. HCl white pr. in sols, of tartar emetic, sol. in excess and not precipitated hy water : H^S dis- tinguishes Sh. BaCl^ white. CaClj white CaC4H,,'^„, suluhle, when washed, in KOH and in NH,C1; and soluble in CHj.COOH. AgNOj white, sol. in HNO3 and in NH3, reduced to sdver by heat. Heated on platinum, they carbonize, with smell as uf burnt sugar : leave carbonates, oxides or metal. Tartar em( tic makes holes in Pt througli alloy-formation. Tartaric acid H.^C^H^Og, very acid. NajCOj (Ifervcscence. Lime-water precipitates it when addfd in quantity, sol. in acetic acid. HjSO^ heated with it, browns at once, witli little evolution of CO. Pb2C„H30.,, white. On Platinum fuses, colors, carbonizes with flame and bunit-suiiar smell, leaving no residue. XXVIII. Citrates. Not ])reeipitated by CH3.COOK. CaCl^ an immediate prec. on heating, insoluble in KOH when washed, but sol. in NH4CI. Lime-water, in excess, on boiling, a slight white pr. ditappearing on cooling. AgNOj white^Ag^C^HsO;, sol. in KH3 and HNO3, not blackening on heating. Citric acid HgC^H.Oj, very soluble, and acid. Na.CO,, effervescence. CaClj no prec. even after addition of NH3. until heated. HoSO^, and heat, evcdves at first CO in quantity, burning with blue flame, and only darkening at last. Pb2C„H36j, white PbjzCgH^Oj, sol. after washing, in NH4OH. On Platinum, fuses, carbonizes, with evolution of pungent acid vapors, and burns away. XXIX. Malates: nut precipitated by CH3.COOK. Ca.C\, on heating a white pr. in cone, solutions. Lime-water no reaction. AgNOj white Ag^C^H^O^, only gray on boiling. Malic acid H2C4H4O5, very acid, indistinctly crystalline, resembling glucose in appearance. NaaCOj elfervescence. PhzC^HjOj. white, cryst. CaCU no reaction. H^SO^, heated gives CO and CO,, browning and blackening like Tartaric acid. On Platinum, fuses, pun- gent acid vapors with frothing effervescence ; burns away. XXX. Meconates. Cdorless. CaClj white. FeoCl,., blood- red coloration, see Group D. XXXI. Orthophosphates: of alkalies soluble. Chief salts :— Na2HP04,i2H20, and NaNH,HP04,4H20. HCl no visible re- action. HCl + HjS, none (not an arsenit.). BaCl. white, sol. in HCl or HNO3. CaCL white Ca32P0, soluble in CH3COOH. re,CI„, while FePO,. Pb2C.,H30„, white. NH.Cl -f KH.OH -f MgSO,, white, cryst. NH4MgP04,GH20. Ammonium molybdate in nitric acid yellow pr. containing 3 per cent. P2O5. AgNOj, yeUow AgjPO,, sol. in NH^OH and in HNO3. On Platinum, fuse: into metapho?phates or pyrophosphates which give white AgPOa and Ag4P20;. Orthofhosphoric acid H3PO4, sour, syiupv liquid, into clear ^lass HPO3 on heatmg. [Metaphosphates, by boiling with acids into orthophos]iheric acid. In presence of acetic acid, HPO3 precipitates albumen.
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