Equilibria for Basic Compounds or Alkali Ions 
Base or Ion  Equilibrium (all in aqueous solutions)  Kb
Lead hydroxide Pb(OH)2  <=======>   PbOH+1 + OH-1  9.6 x 10-4
Zinc hydroxide Zn(OH)2  <=======>   ZnOH+1 + OH-1  9.6 x 10-4
Silver hydroxide AgOH  <=======>   Ag+1 + OH-1 1.1 x 10-4
Ammonia NH3(aq) + H2O  <=======>   NH4+1 + OH-1  1.8 x 10-5
Hydrazine N2H4 + H2O  <=======>   N2H5+1 + OH-1  1.7 x 10-7
Hydroxylamine NH2OH + H2O  <=======>   NH3OH+1 + OH-1  1.1 x 10-8
Beryllium hydroxide Be(OH)2  <=======>   Be2+ + 2 OH-1  5.0 x 10-11