What was the ph of the original benzoic acid solution what, Chemistry

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What was the ph of the original benzoic acid solution what

Assume you dissolve 0.279 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 1.91 102 mL of solution and then titrate the solution with 0.135 M NaOH.

C6H5CO2H(aq) + OH ? (aq) C6H5CO2? (aq) + H2O(l)

(a) What was the pH of the original benzoic acid solution?

(b) What are the concentrations of all of the following ions at the equivalence point?
Na+
M
H3O+
M
OH ?
M
C6H5CO2?
M

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