The following pictures represent aqueous solutions of three acids HA (A = X,Y,or Z) ;water molecules have been omitted for clarity. 
-Which acid has the smallest value of Ka?
Definitions:
Marginal Cost
The amount needed to make one more unit of a certain product or service.
Total Economic Costs
The sum of all expenses a firm faces, including both explicit costs (direct payments) and implicit costs (opportunity costs).
Marginal Revenue
The gain in income from selling an additional unit of a product or service.
Marginal Cost
The cost implications of producing an additional unit of either a product or service.
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