The `pH` of `0.004M` hydrazine `(NH_(2).NH_(2))` solution is `9.7`. Calculate its ionisation constant `K_(b)` and `pK_(b)`.

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

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

The pH of 0.004M hydrazine solution is 9.7 . Calculate its ionization constant K_(b) and pK_(b) .

The pH of 0.004 M hydrazine solution is 9.7. its ionisation constant (K_(b)) is

Caculate the pH value of 0.20M solution of methyl amine (CH_(3)NH_(2)) at 298 K, given that its ionisation constant (K_(b)) is 4.4 xx 10^(-5).