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1L of an aqueous solution contains 0.15mole of CH3COOH (pKa = 4.8) and 0.15 mole of CH3COONa. After the addition of 0.05 mole of solid NaOH to this solution, the pH will be

(1) 4.5

(2) 4.8

(3) 5.1

(4) 5.4