50.00 mL of 0.25 M HNO2 (nitrous acid, Ka = 4.74 x 10^-4) is titrated with 0.25 M KOH solution. What would be the pH of the solution after 25.00 mL of the KOH solution is added?

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.