Indirect EDTA determination of cesium. Cesium ion does not form a strong EDTA complex, but it can be analyzed by adding a known volume of NaBil, in cold concentrated acetic acid containing excess Nal. Solid Cs, Bi, I, is precipitated, filtered, and removed. The excess yellow Bil is then titrated with EDTA. The end point occurs when the yellow color disappears. (Sodium thiosulfate is used in the reaction to prevent the liberated I" from being oxidized to yellow aqueous I₂ by O, from the air.) The precipitation is fairly selective for Cs+. The ions Li*, Na+, K+, and low concentrations of Rb+ do not interfere, although TI+ does. Suppose that 30.00 mL of an unknown containing Cs* were treated with 30.00 mL of 0.08381 M NaBilд and the unreacted Bilд required 13.06 mL of 0.0466 M EDTA for a complete titration. Find the concentration of Cs* in the unknown.

Indirect EDTA determination of cesium. Cesium ion does not form a strong EDTA complex, but it can be analyzed by adding a known volume of NaBil, in cold concentrated acetic acid containing excess Nal. Solid Cs, Bi, I, is precipitated, filtered, and removed. The excess yellow Bil is then titrated with EDTA. The end point occurs when the yellow color disappears. (Sodium thiosulfate is used in the reaction to prevent the liberated I" from being oxidized to yellow aqueous I₂ by O, from the air.) The precipitation is fairly selective for Cs+. The ions Li, Na+, K+, and low concentrations of Rb+ do not interfere, although TI+ does. Suppose that 30.00 mL of an unknown containing Cs were treated with 30.00 mL of 0.08381 M NaBilд and the unreacted Bilд required 13.06 mL of 0.0466 M EDTA for a complete titration. Find the concentration of Cs* in the unknown.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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