Approximately 4 metric tons of quinoline, C₉H₇N, is produced annually. The principal source of quinoline is coal tar. Quinoline is a weak base in water. A handbook gives K_a = 6.3 x 10^-10 for protonated quinoline, C₉H₇NH⁺. Write the ionization reaction for C₉H₇NH⁺ and calculate pK_b for quinoline.

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H H H Η Η - H Ζ H Η 6 7 8 Ν΄ 1 3 2