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How many mol of HCl would have to be added to 0.874 L of a 2.485...

How many mol of HCl would have to be added to 0.874 L of a 2.485 M B: in order to obtain a buffer with a pH of 8.90? (The Kb for B: is 5.82*10^-3 3 ). Assume there is no volume change.

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