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The Ka of lactic acid is 1.4x10^-4. If you mix 100 mL of a 0.1 M solution of lactic acid with 4 mL of 1.0M solution of NaOH, what is the pH of the resulting solution? 1. 9.98 2. 3.85 3. 7.00 4. 3.67 5. 4.02 6. 10.15