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The pH of 0.005 M codenine (C(18)H(21)NO...

The `pH` of `0.005 M` codenine `(C_(18)H_(21)NO_(3))` solution is `9.95`. Calculate its ionisation constant and `pK_(b)`.

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The correct Answer is:
`1.591xx10^(-6)`, 5.8
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