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What is the final pH of a solution containing 100 mL of 0.2 M HX and 300 mL of 0.1 M NaX after 0.01 mol of NaOH is added? The pKa is 3.00. 1. 12.40 2. 3.60 3. 3.00 4. 2.70 5. 2.40