A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe.

  • Thomas Edward Thorpe
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: A series of chemical problems with key for use in colleges and schools / by T.E. Thorpe. Rev. and enl. by W. Tate ; with a preface by H.E. Roscoe. Source: Wellcome Collection.

    145/160 (page 133)
    240. o'395i gram of substance gave o'6544 gram of NH^MgAsOj, H2O = o'378i gram AsgOg: hence the substance contained 9570 per cent, arsenic anhydride. 241. The percentage results of the analysis are : — Silica 4°'35 Ferric oxide 36'43 Water 20‘62 Lime 2’68 100 08 Neglecting the lime as an unessential constituent, the percentage composition of the mineral becomes ;— Silica 41 46 Ferric oxide 37 43 \\ater 21‘19 ioo'o8 The simplest ratios of the oxygen contained in each of the constituents is 6 ; 3 : 5. Hence the formula of the compound is 3 SiOa, FjO^, 5 H.^O. 242. 164'I grams of KoPt Cl,-, are equivalent to 5o'39 grams of potassium chloride. Hence the composition of the mixture is : — Potassium chloride 50'39 Sodium chloride 49‘6i lOO’OO 243. o’2476 gram Tlj Pt Cl„ = 0T239 grams thallium, or 67'67 per cent. Its composition is therefore :— Tl.. Cl O, 67-67 32-33 ] 00-00