# Question & Answer: Solubility Equation: a. K_2[Cu(C_2(C_2O_4)_2] + H_2O rightarrow {K_2[Cu(C_2O_4)_2]…..

Solubility Equation: a. K_2[Cu(C_2(C_2O_4)_2] + H_2O rightarrow {K_2[Cu(C_2O_4)_2] middot 2 H_2 O} Solubility Expression i. K_sp = {K_2[Cu(C_2O_4)_2] middot 2H_2O} Prepare sample. a. Start with about 0.250 g of product in a large test tube and make a solution. Prepare copper (II) sulfate pentahydrate calibration standards. a. Prepare 25 mL of 0.10 M stock solution of CuSO_4 solution using solid CuSO_4 middot 5 H_2O. i. Your procedure should give specific steps and amounts b. Prepare 10 mL of 0.01 M, 0.02 M, 0.05 M, and 0.06 M CuSO_4 solutions using the stock solution. i. Your procedure should give specific steps and amounts Determine wavelength for measurements. a. Use one of the standards to measure the absorbance spectrum of the copper(II). i. Take absorbance readings from 460 to 840 nm. ii. Measure the absorbance of copper (II) sulfate every 20 nm. iii. Calibrate the spectrometer at each new wavelength. iv. Determine the optimum wavelength for your experiment based on the wavelength where the absorbance is a maximum.