The given complex ions are to be ranked in order of increasing wavelength of the light absorbed. Concept introduction: The capacity to absorb light by complex ion is directly proportional to crystal field splitting energy and energy absorbed is inversely proportional to the wavelength. To rank: The complex ions Co ( H 2 O ) 6 3 + , Co ( CN ) 6 3 − , CoI 6 3 − and Co ( en ) 3 3 + in order of increasing wavelength of the light absorbed.

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For each scenario below, select the color of the solution using the indicator thymol blue during the titration. When you first add indicator to your Na2CO3solution, the solution is basic (pH ~10), and the color is ["", "", "", "", ""] . At the equivalence point for the titration, the moles of added HCl are equal to the moles of Na2CO3. One drop (or less!) past this is called the endpoint. The added HCl begins to titrate the thymol blue indicator itself. At the endpoint, the indicator color is ["", "", "", "", ""] . When you weren't paying attention and added too much HCl (~12 mL extra), the color is ["", "", "", "", ""] . When you really weren't paying attention and reached the second equivalence point of Na2CO3, the color is

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Chapter 20, Problem 57E

Interpretation Introduction

Interpretation: The given complex ions are to be ranked in order of increasing wavelength of the light absorbed.

Concept introduction: The capacity to absorb light by complex ion is directly proportional to crystal field splitting energy and energy absorbed is inversely proportional to the wavelength.

To rank: The complex ions Co(H2O)63+, Co(CN)63−, CoI63− and Co(en)33+ in order of increasing wavelength of the light absorbed.

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