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To Simulate the PH of Blood, Which Is 7

Question 7

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To simulate the pH of blood, which is 7.4, an undergraduate researcher in a biology lab produced a buffer solution by dissolving sodium dihydrogen phosphate (Ka = 6.2 10-8) and sodium hydrogen phosphate (Ka = 3.6 10-13) together in an aqueous solution. What mole ratio of Na2HPO4/NaH2PO4 did she need to use?

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