Abstract
Summary Formation of a pink-colored chelate between lanthanum and Alizarine Red S has been reported. The region of maximum absorbance of the chelate lies at 520 mµ . The molar ratio of lanthanum to the chelating agent has been determined to be 1:2, using three different methods: the mole ratio method, the slope ratio method, and the method of continuous variations. The chelate is stable between pH 3.5 and 6.5. The value of log k (log k = stability constant) as determined by the method of Dey et al. , the mole ratio method, and the method of continuous variations, is 8.6, 8.6, and 8.3, respectively.
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