A mixture was made from solutions of sodium sulfate and aluminium sulfate. 286 mL of 0.500 M Na2SO4 solution and 168 mL of 0.300 M Al2(SO4)3 solution were mixed together. Calculate the concentration of SO42- ions in the final solution?
Take the final volume to be the sum of volumes. Do not use scientific notation in your answer. Answer to 3 significant figures and do not include units.