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one litre of an aqueous solution contain...

one litre of an aqueous solution contains 0.15 mole of `CH_(3)COOH(pK_(a) =4.8))` and 0.15 mole of `CH_(3)` COONa. After the addition of 0.05 mole of solid NaOH to this solution, the pH will be :

A

4.5

B

4.8

C

5.1

D

5.4

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