7. Putting it all together! Ground water in many areas of the world is considered to be "hard," meaning that it is high in dissolved mineral content, primarily calcium. General guidelines for classification of waters are: 0 to 24ppm calcium is classified as soft; 25 to 48ppm as moderately hard; 49 to 72 ppm as hard; and more than 72ppm as very hard. One way to determine the hardness of a water sample is to precipitate the calcium out of solution as a carbonate. The net ionic reaction for this precipitation is: Ca2+(aq)+CO32(aq)CaCO3(s) a. A 1.00 L sample of water is drawn from a Phoenix, AZ well and 0.048g of calcium carbonate is recovered using the above reaction. What was the Ca2+ concentration of the original water sample in ppm? Show your work and include units. Hint: ppm stands for parts per million, and in the case of an aqueous solution, this is equivalent to mg/L. b. How would the hardness of this water sample be classified