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Weak acids are the only types of acids that we'll consider Ka values. In strong acids, there will be no Ka value because it will always be undefined as the acid will dissociate completely, leaving no concentration of reactant left.
As mentioned above, we only account for the Ka values for the weak acids, since we know that the strong acids basically dissociate 100%. Also, when x is 5% of the initial concentration, we can get rid of the x since it would be such a small negligible amount anyway.
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