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Answer:
Ka = 6.02x10⁻⁶
Explanation:
The equilibrium that takes place is:
We calculate [H⁺] from the pH:
Keep in mind that [H⁺]=[A⁻].
As for [HA], we know the acid is 0.66% dissociated, in other words:
We calculate [HA]:
Finally we calculate the Ka: