| OCR Text |
Show 5 wi th Hel. Precipi ta.,te ti tra 't e ho t; agai nst the The method used wi th 3 gnama of par t.s. z-inc same 50 Add. a in d.et:ermina;tion t.he tbe mi xnur e a. oxide. Mix sample in 1 o.f of' t.o t a.l, sulphur a water and. mass wi th HCl and wi.t h 2 ceve.r of grams to a. 250 cc beaker-, , fil tar and wash wi th hot: water hail, a.rO]t of' pheno.Lpht.had ef.n j uat ac.Ld and 4 br!g;h,t redness fer 20 minut;es. cool and. t.l'.ans'fex' the cc., porcelain cruci.ble a. part, s70di um cazbonaf e to thoroughly Hea.t" to mixture. Allow.: t.o Add Sulphur. follows: as Mix 0.5 gram of the· and H2S wa.ter, pota,ssd um ferrocyanide. Total wa.s c:opp,er- wi th s e.l.ut.Lon then add. 4 CC. aa in an jJJ1ldicato:r, exne s e make Dilute , • to. \ 400 with water C;C.. bari urn ae the in . a Calcul.ate. sul:p:b..a_t:e:., sul:phur porcelain the cr ucd ble and wi th su!:ghate ](gni te , weigh baz-Lum as perce:ntage of sulphur from this , Bulpnll:r The. me t hcd Pr eaen t. fo.r was: Bot.! 0.5 gram a1' the acid. for 15 mi:nutes" 15 mf nut.ea Soluble as Sul:phur Compounds. dete.rm:kning the. su!Qhur pre:se.nt, sul.phur- compcundis soluble Bail the, then fil t,er: and wash with hot, wa.t er otrt, pr-ec .ip.:ita:te wed gh t .. Allow. t,Q. s-tandi hot. until bar-L um ch10rid·e. t t.Le.s hO.il: and. preci.pi tat e I as fol!lo.ws: sample in 15 cool and nearly' cc . o.f' 40% acetic neutu a.Li.ae wi th ammonia. fil te.E' and. wash w:i.th ho.t annnonf,a, .ammcrri um ... , as |
