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Calculate the pH change following addition of 11 mL 7 M HCl to a buffer prepared by adding 240 mL 0.9 M KH 2 PO

  1. Calculate the pH change following addition of 11 mL 7 M HCl to a buffer prepared by adding 240 mL 0.9 M KH2PO4 and 267 mL 1 M K2HPO4. The pKa of the phosphate buffer is 6.82. What is the overall concentration of this phosphate buffer?

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