Summarize HSAB theory?
Hard acids have affinity towards hard bases and soft acids have affinity towards soft bases.
One can characterize a base/acid as a hard or soft based on the following:
1) Hard acids and hard bases:
-have high electronegativity, high oxidation state and low polarization ability.
2) Soft acids and soft bases
-have low electronegativity, low oxidation state and high polarization ability.
List of hard/soft acids/bases can be seen here: