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Calculate the expected buffer capacity of the phosphate buffer based on the number of moles HPO42-...

Calculate the expected buffer capacity of the phosphate buffer based on the number of moles HPO42- in the buffer (Hint: You know the concentration and volume). In other words, how many moles of HCl are needed to break the buffer? Does the measured buffer capacity of the phosphate buffer meet with your expectation? Explain.

My HCl concentration is 2.86 x10^-4

100 mL of a buffer containing 0.050 M K2HPO4 and 0.050 M KH2PO4

only 20 mL of buffer is used.

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