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(1)- 15.0 mL of 0.400 M Hno3 Solution is titrated with 0.600 M KOH solution . Calculate pH of the solution when12.0 mL of KOH is added ?

(2)- 20.0 mL of 0.25 M of HC2H3O2 is titrated with 0.40 M Naoh, Calculate the pH of the solution after 15 mL NaOH is added. Ka(Hc2H3O2)=1.8x10^-5

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