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50.00 mL of 0.15 c6h5cooh ( a weak monoprotic acid, Ka = 6.3x10^-5) is titrated with...

50.00 mL of 0.15 c6h5cooh ( a weak monoprotic acid, Ka = 6.3x10^-5) is titrated with a 0.30 M KOH solution. Calculate pH at different points of titration:

1- before any added base 2- after 5.0 mL of base is added 3- after 12.5 mL of base is added 4- after 25.0 mL of base is added 5- after 3.0 mL of base is added

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