7. How many milliliters of 0.202 M NaOH should be added to 25.0 mL of 0.023 3 M salicylic acid (2- hydroxybenzoic acid) to adjust the pH to 3.50? [salicylic acid (H2A, pK₁ = 2.972, pK₂ = 13.7)]
(A) 1.023
(B) 2.223
(C) 3.323
(D) 4.023
(E) 5.223

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