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.

Question

You wish to add enough NaOCl (sodium hypochlorite) to a 150 m³ swimming pool to provide a dose of 5.0 mg/L TOTOCI as Cl2. (a) How much NaOCI (kg) should you add? (Note: the equivalent weight of NaOCl is based on the reaction: NaOCl + 2H + 2 e→CI + Na +H₂O.) (10 pts) (atomic weight: Na 23, O 16, C1 35.5) (b) The pH in the pool after the NaOCl addition is 8.67. To improve disinfection, you want at least 90% of the TOTOCI to be in the form of HOCI (pKa 7.53). Assuming that HOCI/OCI is the only weak acid/base group in solution, what volume (L) of 10 N HCl must be added to achieve the goal? (15 pts) Note that part a) is a bonus question for undergraduate students. If you decide not to work on this part of the question, you many assume TOTOCI = 7×10-5 M for part b).

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Question

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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