## Summary:

• A base can be defined as a substance, which accepts a hydrogen ion from another substance.
• A strong base is a base, which ionizes completely in an aqueous solution.
• Weak bases are a base that ionizes only slightly in a solution of water.
• A base ionization constant is the equilibrium constant for the ionization of a base.
• For ammonia the expression is: For ammonia, the equilibrium greatly favors the reactants and the extent of ionization is very small.
• The numerical value of  is a reflection of the strength of the base.
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