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Phosphate buffers are important in regulating the pH of intracellular fluids at pH values generally between 7.1 and 7.2.
a. What is the concentration ratio of H2PO4− to HPO42− in intracellular fluid at pH = 7.15?
b. Why is a buffer composed of H3O4 and H2PO4− ineffective in buffering the pH of intracellular fluid?

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