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After softening, water is known to have a buffer of 93 mg/L as CaCO3, and a pH of 9.6. How many millimoles (mmol) of hydrogen

After softening, water is known to have a buffer of 93 mg/L as CaCO3, and a pH of 9.6. How many millimoles (mmol) of hydrogen ion need to be added (per litre) to bring the pH down to 9?

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