File:Miniature apparatus for the determination of manganese in pyrolusite or of iodine in iodides (Alessandri 1895.43).png

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Miniature apparatus for the determination of manganese in pyrolusite or of iodine in iodides

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Italiano: Per determinare il contenuto di manganese in un campione di pirolusite, ne si inseriscono pochi centesimi di g in un palloncino D assieme a dell'acido cloridrico. Per riscaldamento su fornelletto L si producono vapori di cloro, raccolti da un tubo C, A e gorgogliati in una provetta B con soluzione nota di ioduro di potassio. Dopo pochi minuti l'emissione di cloro cessa, e la soluzione viene titolata per iodometria, con tiosolfato sodico e salda d'amido. La medesima operazione può essere svolta con uno ioduro e acido solforico per determinare lo iodio totale nel sale.
English: To determine the manganese content in a pyrolusite sample, a few centigrams are placed in a small round bottom flask D connected by a pipe C, A to a test tube B filled with a known solution of potassium iodide. After a few minutes the flow of chlorine stops, and the solution is titrated with sodium thiosulphate and starch. This procedure can be also used to measure the released iodine from an iodide sample.
Date
Source Alessandri, P. E. Analisi Volumetrica Applicata Ai Prodotti Commerciali e Industriali; Ulrico Hoepli: Milano, 1895.
Author valeg96

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