2) A calibration solution contains 1.50 mL of 0.00200 M NaSCN, 5.00 mL of 0.200 M FeCl3, and enough 0.100 M HNO3 to make a total volume of 25.0 mL. Assuming that [Fe3+] is sufficient to drive the reaction to completion, what is the concentration of FeSCN2+ in this solution? (Answer: 1.20 x 10-4 M)
3) A student prepares an equilibrium solution by mixing 5.00 mL 0.00200 M Fe3+, 2.00 mL 0.00200 M SCN-, and 3.00 mL 0.100 M HNO3. What are the initial concentrations of Fe3+ and SCN- in this solution? (Answers: [Fe3+] = 1.00 x 10-3; [SCN-] = 4.00 x 10-4)