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13. At 25°C, given that the Ka for HA is 3.5 x 10⁻⁸, calculate the K value for the reaction of HA with .
(A) 3.5 x 10⁶
(B) 3.5 x 10⁻⁸
(C) 3.5 x 10⁻²²
(D) 2.9 x 10⁻⁷
(E) none of these