Lime

I am confused about the various forms of lime.

I am trying to convert Potassium carbonate from ash drippings into KOH.

I have some CaO Calcium Oxide from an ancient chemistry set but it does 
not disolve in water or in the Pot carbonate.

The definitions I have come up with are very confusing such as calling 
CaO slaked lime but it must not be or it would dissolve in water.

Any help?

js




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