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Problem- Phosphate buffers are integral in the human body, by regulating the pH of intracellular fluids at pH 7.1-7.2. What is the concentration of H2PO4- to HPO42- in an intracellular fluid at pH = 7.15? Ka = 6.23 x 10^-8. (Please illustrate the math)

a. 0.5

b. 3.5

c. 1.1

d. 2.1

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