The dissociation constant is 3.715 x 10-5 for the first step and 3.89 x 10-6 for the second step.
An acid dissociation constant, Ka, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction known as dissociation in the context of acid-base reactions. The equilibrium can be written symbolically as: HA A− + H+,
If an equilibrium mixture is diluted, the concentration of the acid will seem to be less. This will increase the value of Kc (the equilibrium constant). For weak acids, Kc is given the symbol Ka, and called the acid dissociation constant. I would therefore presume that Ka will be affected the came way as Kc (i.e. increased).
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