A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with water to a final volume of 50.00 mL. Assume that all the cobalt in the ore sample is converted to Co2+(aq) .
a. What is the [Co2+] in the solution if the absorbance of a sample of the solution is 0.74?
b. Calculate the number of moles of Co2+(aq) in the 50.00 mL solution.
c. Calculate the mass percent of Co in the 0.630 g sample of the ore.
