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The pH of a solution formed by mixing 20.0 mL of 0.250 M formic acid, HCOOH, and 8.0 mL of 0.400 M NaOH is 3.99. Determine the Ka for formic acid. A) 1.8 ×10^-5 B) 1.0 ×10^-4 C) 1.6 ×10^-4 D) 1.8 ×10^-4 E) 1.2 ×10^-5