Cobalt ions form the complex ion hexaaquacobalt(II), [Co(H₂O)6]2+, with water molecules. In the presence of chloride ions the complex ion tetrachlorocobalt(II) [CoCl4]2 is formed. [Co(H₂O)6]2+ (aq, pink) + 4Cl- (aq) = [CoCl4]²- (aq, blue) + 6H₂0 (1) Focus Questions: 1. What is the dominant species of cobalt at each step? 2. Is the formation of the tetrachlorocobalt(II) complex an exothermic or an endothermic process? (Hint: watch for temperature changes). 3. Are there any other ways of shifting this equilibrium?

Cobalt ions form the complex ion hexaaquacobalt(II), [Co(H₂O)6]2+, with water molecules. In the presence of chloride ions the complex ion tetrachlorocobalt(II) [CoCl4]2 is formed. [Co(H₂O)6]2+ (aq, pink) + 4Cl- (aq) = [CoCl4]²- (aq, blue) + 6H₂0 (1) Focus Questions: 1. What is the dominant species of cobalt at each step? 2. Is the formation of the tetrachlorocobalt(II) complex an exothermic or an endothermic process? (Hint: watch for temperature changes). 3. Are there any other ways of shifting this equilibrium?

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter3: Equation, The Mole, And Chemical Formulas

Section: Chapter Questions

Problem 3.157QE

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