3. You perform an alkalinity test on a water sample with an initial pH of 9.75. The alkalinity is 12.1 mg/L as CaCO3. (a) Calculate the Cr value. Answer: 1.54x10^4 M (b) Determine whether there is any potential to precipitate CaCO3 in the pipes given a calcium concentration of 15 mg/L. Justify your answer. Answer: Calculations show that it exceeds the Ksp, so yes, there is a potential. (c) For the same calcium concentration and CT, determine the potential to precipitate CaCO3 if the pH were to b

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