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What is the pH of a 0.15 M hydrogen selenite ion, HSeO3−, if its Ka and Kb values are 4.8×10−9 and 4.2×10−12, respectively?

What is the pH of a 0.15 M hydrogen selenite ion, HSeO₃⁻, if its K_a and K_b values are 4.8×10⁻⁹ and 4.2×10⁻¹², respectively?