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An assuming individual had 4.40 ml of 1.000 M HCl injected into their bloodstream. Assuming that the person has 1 gallon of blood circulating, and that the buffering capacity is controlled by phosphate buffer present at a formal concentration of 0.0250 moles L^-1 and pH of 7.35, what is the global pH change incurred after injection of the HCl? What would the pH change be if the same amount of 1.000 M HCl were put into a gallon of pure water?

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