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Nicotine, C10H14N2, has two basic nitrog...

Nicotine, `C_10H_14N_2`, has two basic nitrogen atoms and both can react with water to give a basic solution
`Nic(aq) + H_2O(l) Leftrightarrow NicH^+ (aq) + OH^(-)(aq)`
`NicH^+(aq) + H_2O(l) Leftrightarrow NicH_(2)^(2+) (aq) + OH^(-)(aq)`
`K_(b1)" is "7 xx 10^(-7) and K_(b2)" is "10^(-10)`. Calculate the approximate pH of 0.020 M solution.

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