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# What volume (to the nearest 0.1 mL) of 7.50-M HCl must be added to 0.300 L...

What volume (to the nearest 0.1 mL) of 7.50-M HCl must be added to 0.300 L of 0.150-M K2HPO4 to prepare a pH = 7.50 buffer?

(pKa of hydrogen phosphate ion = 12.32)

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