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You have 75.0 mL of 0.14 M HA. After adding 30.0 mL of 0.10 M NaOH, the pH is 5.50. What is the Ka value of HA? a. 3.2x10^-6 b. 1.3x10^-6 c.0.40 d.9.0x10^-7 e.none of these