Water contains 500 mg/L of calcium as Ca". It is desired to remove the calcium via precipitation to form calcium hydroxide Ca(OH)2. The solubility product Ksp for calcium hydroxide is 8x10-6, Report the percentage of calcium able to be removed at pH values of 7, 8, 9, 10 and 11. Determine the pH required for 90% removal via precipitation. If this process is to be conducted in a full rectangular contact basin 2m deep x 2m wide x 4 m long, calculate and compare the mass of solid precipitate produced at each pH examined above.

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