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16. After lime softening, the pH of water is 12. Given a carbonate concentration of [CO3-] = 120mg/L, what volume of 1% HCI is needed

16. After lime softening, the pH of water is 12. Given a carbonate concentration of [CO3-] = 120mg/L, what volume of 1% HCI is needed to be added to reduce the pH to 9.0

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