During part i of the water analysis series, you prepared a stock solution of phosphate ion containing 50.0 mg p/l. in the second part of this experiment, you will use this stock solution to prepare standard solutions to be used to make a calibration plot. as described in the background information for this experiment, the concentration of phosphorus in these standards should be between 0 mg /l (solution a)and 0.6 mg/l (solution c). a. describe how you are going to prepare solution c, which must contain 0.3 mg p/l. assume you are going to use a 250-ml volumetric flask for this preparation. be sure to include necessary calculations !