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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    for a In-carbonato. NH.OH.j white hydroxide, slowly and in- coiui)letely: in presence of ammoniacal salts or of tree aeids, vn precipitate. NaHPO^. added to a solution containing NH CI + NH OH, an immediate white crvstallino MgNH,PO|, (.H.,b KOH. NaOlI, LOH, Ba(OH)„, Sr(OlI),, and Ca(OII)„. precii.itate 3Ig(0H).,. (NH,),CoO,, no precipitate at all (except in very coneentrated' solutions after a time). No color to flame: ^IltO, rose-colored when ignited on platinum with C02NO3. Magnesia is weiglied as MgO, containing 60 per cent, of Mg, and as Mg-.PjO. containing 36.21 per cent, of MgO. Gronp YI. Metals not precipitated by NaoCOj, nor by any of the preceding tests. Inehule kalium, natrium, lithium, caesium, rubidium, and ammonium. 31. Ammonium hydroxide NH^OH only known in solution. Evolves NH3 as a gas of ammoniacal (!) odor, blueing red litmus, and forming white fumes of NH^Cl with a glass rod steeped in HCl. No residue on platinum. AgN03 grey-brown AgoO. easily soluble. No effervescence, when diluted, on addi- tion' of HCl. Nessler's test, yellow or brown NHg^IjHoO. With 2HCI + PtCl^, yellow 2NIi^01,PtCl4. Salts: all soluble, except 2NH,CI.PtCl^ and with difHculty ammonium hydrogen tar- trate. Chief salts. NH^Cl. (NHJ.SO,. NH.NOj. NH.NO^. 2[(NHj).,C0J C0„. Solutions neutral, allcaline or acid. NaoCOj boiled with any salt of ammonium, even when quite neutral or acid, evolves ammonium carbonate, smells of NPI3, fumes with HCl and blues red litmus. KOH, Ca(0H)2 and all intermediate hydroxides displace NH3 which is recognized as above. PtClj, yellow 2NH,Cl,PtCl^. Salts volatilized by heat, with or with- out decomposition. Fixed acids remain. 32. Potass-oxide K^O, grey. Hydroxide KOH, white, fusible, partially volatile, with violet color to flame. Strongly alkaline. Na5C03 no reaction, even on boiling (absence of NH^ baits). AgNOj grey-brown Ag,0, insoluble in excess. Nearly all salts soluble, except 2KCl,PtCl4 and 2KF,SiF^. Chief salts: K„CO„ 2H2O. KHCO3. K„SO,. KCl. KCIO3. KI. KBr. Solu- tions colorless, except in the case of chromates (yellow), dichro- mates (yellow-red), ferrocyanide (yellow), &c. e\cc. Na2C03 no reaction, even on boiling. After proving absence of NH., salts : HCl + PtCl^ yellow 2KCl,PtCl4, nearly insoluble in alcohol- ether. Stirring promotes the precipitation Concentration in ddute solutions necessLiry. Tartaric acid H2C4H4O0, in excess, wdiite crystalline KHCiH^O^, soluble in alkalies, and in acids. 2HF,SiF, nearly wlute 2KF,SiF4. The violet tint of flame best observed through Ijlue glass. 33. Lithium oxide LjO, white. Hydroxide LOH, white, least soluble of alkalies. Alkaline. Chief salt : LCI, deliques-
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