Imagine that you are the chemist at a cement factory. You are responsible for analyzing the factorys wastewater. If a 50.0 mL sample of wastewater contains 0.090 g of Ca2+ (aq) and 0.029 g of Mg2+ (aq), calculate the concentration of each ion in ppm.

Answer: Ca2+ = 1.8 103 ppm; Mg2+ = 5.8 102 ppm (please show how you arrived to this answer)