Qualitative Chemical Analysis a Guide in Qualitative Work With Data for Analyti
Qualitative Chemical Analysis a Guide in Qualitative Work With Data for Analyti
A B Albert Benjamin Prescott
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Ferro- and ferricyanides do not yield HCN under 80 (Hilger and Tamba, Z. , 1891, 30, 529; also Taylor, C. N. , 1884, 50, 227). 9. Estimation. (a) The nearly neutral solution of cyanide is titrated with standard silver nitrate. No precipitate occurs as long as two molecules of alkali cyanide are present to one of silver nitrate. Soluble AgCN, KCN is form id. As soon as the alkali cyanide is all used in the formation of the doub e cyanide, the next molecule of silver nitrate decomposes a molecule... of tJie double salt, forming- two molecules of insoluble silver cyanide; giving a white precipitate for the end reaction. Chlorides do not interfere (Liebig, A. , 1851, 77, 102). (6) By titratioii with a standard solution of HgCl 2, applicable in presence of cyanates and thiocyanates (Hannay, J. C. , 1878, 33, 245). 231. Hydroferrocyanic acid. H 4 Fe(CN) = 215. 932. H' 4 Fe"(CN)-' . Absolute hydroferrocyanic acid (230, 0, Class IT. ), is a white solid, freely soluble in water and in alcohol. The solution is strongly acid to test-paper, and decomposes carbonates, with effervescence, and acetates.
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