Abstract
Abstractp‐nitrobenzene azochromotropic acid (Chromotrope 2 B) forms a 1 : 1 reddish violet chelate (λmax 540 mμ) with lanthanum(III) at pH 6.0. The value of stability constant expressed as log K = 4.5 and 4.9 as determined by two different methods. The colour of the chelate is stable over a wide range of temperature (0–100°) between pH 4.0 and 7.0. The system obeys BEER'S law over a range of 0.34 p. p. m. to 16.7 p. p. m. of lanthanum.
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