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Chelatometric Titration of Lanthanum with Gallein Indicator
Author(s) -
Sun PengJoung
Publication year - 1962
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.196200005
Subject(s) - chemistry , lanthanum , titration , cerium , hexamethylenetetramine , inorganic chemistry , salt (chemistry) , nuclear chemistry , organic chemistry
A method using Gallein as indicator for the direct titration of lanthanum with disodium salt of EDTA was proposed. With this indicator, lanthanum ion can be titrated at the p H of 5.5 to 6.5, using hexamethylenetetramine as buffer. At the end point, the violet color disappeared, giving rise to a red color. The interference of approximately equimolar concentration of various foreign ions was observed. Rare earth metal may be titrated along with lanthanum under the same conditions, as shown by the presence of cerium ion.