Journal . cid è stato neutralizzato. Soluzione diluita di ammoniaca docs nol assorbire carbondioxide dall'aria e complicati e apparecchiatura per tuteladell del liquido è quindi superfluo.- 8. Y. Note sui test f chinina. E. de Vrij. Nieuw, Tijdsch. v. d. Pharm. in Nederland, 2, 365.Quando Igrms. di chinina solfato sono sciolti in 400gnns. di acqua bollente, lgrni. di potassio chmmatedissolved in un po' di acqua aggiunta e il liquido messo asidefor diverse ore, chinina eliminare è depositato incrystals, anidro, e hanno le compositioni. ,1I,,N .ti.v.H.trn,.* Una parte o

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Journal . cid has been neutralised. The dilute solution of ammonia docs nol absorb carbondioxide from the air, and complicated apparatus for theprotection of the liquid is therefore unnecessary.— 8. Y. Notes on the Testing f Quinine. E. de Vrij. Nieuw, Tijdsch. v. d. Pharm. in Nederland, 2, 365.WHEN Igrms. of quinine sulphate are dissolved in 400gnns. of boiling water, lgrni. of potassium chmmatedissolved in a little water added, and the liquid put asidefor several hours, quinine eliminate is deposited incrystals, which are anhydrous, and have the compositioni. , 1I, , N .ti.v.H.trn, .* One part of this salt dissolvesin 2733 parts of water at 14 C. For testing quinine forcinchonidine, Sgrms. quinine sulphate are dissolved inoOOgrms. of boiling water, l*2grm. potassium chromatedissolved in a little water added, and the liquid allowedto stand until the next day. The crystals of quininechromate are then filtered and washed. The filtrate iswanned on the water-bath with sodium hydrate for some. Fig. 2. Fig. 3. Pure caustic soda ami zinc may he heated in it for hours, and even when frothing, bumping, or spirting occurs, nocaustic is carried over. Attention must be paid tothe following points : Caustic soda, when not purifiedby solution in alcohol frequently contains nitrite-, whichyield ammonia when heated with zinc. If mercury isemployed, potassium sulphide must be added to thetic alkali in order to decompose mercury-ammoniumcompounds. For lgrni. of mercury lOcc. of a20 per centsolution of potassium sulphide are required. The sul-phide must oe tested for nitrites and nitrates. time, whereby the cinchonidine is precipitated, which isfiltered, dried, and weighed. For determining quanti-tatively the amount of pure quinine in quinine sulphate, Zgnns, of the latter are dissolved in JOOgrnis. of boilingwater and treated with II ogrm. of potassium chromate, as previously described. The crystals are filtered, washed, dried, and weighed, and for every lOOce. of the filtrate OOogrm. q

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1880
• booksubjectchemist
• bookyear1882