50.00 mL of 0.10 M HNO2 (nitrous acid) was titrated with 0.10 M KOH solution. After 7.4 mL of KOH solution was added, the pH in the titration flask will be

(Given Ka = 4.5 x 10-4 )

(Given Ka = 4.5 x 10-4 )

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