Acid-base equilibria

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Which are the strongest bases ? I know that
these are strong: NH₂^-, OH^- . Which is the strongest?
 

Corrie writes ...
 
The NH₂^- ion is a stronger base than the OH^-. It will react with water to produce OH^- ions:
 
NH₂^- + H₂O -> NH₃ + OH^-
 
Other very strong bases are the hydride ion, H^-, the oxide ion, O^2- and the negative hydrocarbon ions found in compounds such as butyl lithium, [C₄H₉^-Li⁺]. The C₄H₉^- ion is the base derived from butane, C₄H₁₀, behaving as an extremely weak acid
 

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updated: 22 July 2007