A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of Na2HPO4 per 355 mL of solution?

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  1. Use the Henderson-Hasselbalch equation.
    pH = pKa + log (base)/(acid)
    base = Na2HPO4 converted to mols/L
    acid = NaH2PO4 converted to moles/L

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