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When biologists study the chemical reactions that occur in living systems, they often use buffer solutions to mimic the pH and osmotic pressure inside a living cell. A common buffer solution consists of dihydrogen phosphate (H₂PO₄⁻) and its conjugate base. This acid-base pair undergoes the equilibrium reaction shown here: H₂PO₄⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HPO₄²⁻(aq) K = 6.31 × 10⁻⁸ Write an equilibrium expression for this equation.
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