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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    KOKATES. CllUOMATES. AUSICNITES. AltSKNATlOS. (■ry^tall^lc B(0IT)3, nadilv soluble in cxcesa or in water. BaCl., white, .solul)le in iieiils. CaCl., wliilo, sol. in aeetic acid urNli.Cl. Moistened witli liOl or 1I,S0, on platinum, ki'ccii color to llanio. BCOH)^, fuses, gives green eolor to llanie. iur- luerie browned. In the case of a borate, add llCl, then turmeric pi.per; on drying, tlie latter retl-browii, and the red stain blued bv SI'da. XAT Chromates of alkalies Hjluble; yellow or yeliow-red. K.,Cr..O- re.ldcus litmus. Na._,C03 with ciibrvericenee, acid to ye'llow iieutial chroniate. without pivcipitation. HCl, deejieua the eolor to red. H..SO., ULodhs of CrOj, crimson, in con- centrated solutions. HCl, heated, evdlves CL and reduces. HCl + H.,S, to blue-green Cr.,CI„ wilh deposit of S. (See H„S.) AgNOj, crimson Ai;.,CrO_|, soluble in ammonia and in uiiric acid. pb:C.,H30„, yellow PbCrO.,, soluble in KOH. BaCL yellow BaCrO,.' CaCl„ no reaction. BijNOj orange-yellow Bi^jCrO^. XVII. Arsenites (P- M)- Alkaline alone soluble; turn red litmus blue. HCl in cone. sols, white As.,03, sol. in cxce.-s, and precipitated by HoS as yellow Asjs^. CuSO, green CUHASO3, sol. witli blue color in NH3. AgNO,, yellow AgjAsOs, very soluble in NH3 and in HNO3 and in ammo- niacal salts. (Dr. Alfred S. Taylor's method of distilling insoluble arsenical compounds with strong HCl is turm d to good account with Scbeele's Green: the distillate contains AbCls, precipitable as yellow As.^Sj by H„S.) [Sulpbarsenites. K3ASS3, alkaline, yellow. With HCl gives H,S and yellow As.Sj.] XVIII. Arsenates (p. 15). Xn„HAsOj,i2H„0, chief soluble salt. Soluble alkaline or acid; colorless. HCl no visible reaction. HCl +H.,S no reaction till evaporated nearly to dry- ness : tlien H.,S yellow As^Sj + soluble in ]SiH,OH. AgNOj liver-brown Ag3AsO,. CUSO4 in arsenates, greenish - blue CuHA^Oj: no pr. in free acid. BaCl, white BaHAsO^. KgoO^ with XHjOH in presence of ammuniacal salts, white, crystalline Nn^MgPOi/ilUO. (Some arsenates, such as ferric arsenate, give no distinct mirror with NajCOj and charcoal.) Eemsch's test and Marsh's test apply to AsjOj and AsoO^. [Sulpharseuates. KjAsS.,, colorless, alkaline. HCl gives lUS and yellow As^S^.] LAntimonites, as 'KSbOo, give white jw. wiih HCl soluble in excess. HCl + HoS, orange SboS3, soluble in IICl as SbClj. Thus : Sb„S3 + 6HC1 = ^SbClj + jH^S.] |_Antimonaies. KJ-I^SbjO. with HCl, white H^SbjO;. With bodiuin salts K^H^Sb.^O; gives white Na2ld2Sb20„ the only insoluble sodium salt. HCl + H^S oran[:e SbjS-.J XIX. Urates. Only alkaline urates soluble. Colorless. D
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