Calculate the change of pH of a buffer system with a pH of 7.323 if 0.217 mol potassium hydroxide was added to the system. It was prepared by mixing 525 mL of 0.9 M phosphoric acid (with a pka of 6.4) and 200 mL of 0.321 M sodium phosphate

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1. Calculate the change of pH of a buffer
system with a pH of 7.323 if 0.217 mol potassium hydroxide was added to the
system. It was prepared by mixing 525 mL of 0.9 M phosphoric acid (with a pka of 6.4) and 200 mL of 0.321 M sodium phosphate.

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