I am Confused on these Question relating to Ksp, Concentration, and Absorbance t

Question

I am Confused on these Question relating to Ksp, Concentration, and Absorbance this a practice assignment with no answer sheet.

10. Would the value calculated for the Ksp of Cu(OH)2, copper (II) hydroxide, be a larger or smaller value if some air bubbles were stuck to the side of the cuvette when taking the absorbance readings for the solutions in test tubes 1-3? Assume that no air bubbles were stuck to the sides of the cuvette when taking the readings for the calibration curve. 11. When analyzing your data, would an error in [Cu2 or [OH-] have a bigger impact on your final Ksp results? Explain why. 12. In part C if you used 0. 10 M HCL hydrochloric acid as one of the solvents, would you predict that the addition of this acid to the solid Cu(OH)2, copper (II) hydroxide, precipitate would increase or decrease the solubility of the solid? Explain why.

Explanation / Answer

10. If air bubbles are stuckinside cuvette. The volume occupied by air bubble will not have any Cu2+ in it. Therefore overall amount of solution present for absorbance is lower, lower absorbance data will be obtained. Lower Cu2+ means lower Ksp value.

11. Yes, Ksp = [Cu2+][OH-]^2

so concentration of both ions directly affect the Ksp value.

12. addign HCl would form CuCl2 in solution, which would reduce free Cu2+ concentration. Therefore more of Cu(OH)2 would dissolve and form free Cu2+ ions. The solubility of Cu(OH)2 thus increases upon addition of HCl.

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