13. A 200-mL of NaOH solution was added to 400 mL of a 2.00 M HNO2 solution. The pH of the mixed solution was 1.75 units greater than that of the original acid solution. Calculate the molarity of the NaOH solution. (Ka of HNO2 = 4.5 x 10-4). You need to show your works.

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