The drawing below depicts an aqueous solution of a particular cobalt(II) coordin

Question

The drawing below depicts an aqueous solution of a particular cobalt(II) coordination compound. The dots in the blown-up circle represent the concentration of the cobalt(II) complex ions in water (water molecules and counter ions not shown). The cobalt(II) complex ion in the solution above absorbs visible light between 450 - 550 nm with a maximum absorbance at 510 nm. Based on this information, the color of the solution is most likely: You have only 1 submission on this question so choose carefully! You need to make a calibration curve for this Co(II) coordination compound solution. You set your spectrophotometer to the wavelength of maximum absorbance and run a blank. Then you put in your first sample, the solution depicted in the drawing above. You find the absorbance of this solution to be 0.33. Your lab partner measures the absorbance of the second solution while you are busy asking your TA a question. When you return, you see that she has recorded the absorbance as 0.22. Which molecular-level drawing below best depicts the solution measured by your lab partner? You have only 2 submissions on this question so choose carefully!

Explanation / Answer

The solution would absorb blue green color. So the color visible asthe color of the solution would be the complimentary color of bluegreen i.e. Red It means that since the blue green wavelengths are absorbed, theother wavelengths are given out and are seen as the color of thesubstance.

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