Assume you dissolve .235 g of the weak acid benzoin acid in enough water to make

Question

Assume you dissolve .235 g of the weak acid benzoin acid in enough water to make 100 mL of solution and then titration the solution with .108 M NaOH What are the concentrations of Na H3O OH and C6H5CO2 at the equivalence point Assume you dissolve .235 g of the weak acid benzoin acid in enough water to make 100 mL of solution and then titration the solution with .108 M NaOH What are the concentrations of Na H3O OH and C6H5CO2 at the equivalence point What are the concentrations of Na H3O OH and C6H5CO2 at the equivalence point

Explanation / Answer

the titration reaction is C6H5CO2H + Na+ OH- ---> C6H5CO2-Na+ + H2O

at the end point all the acid is consumed and we have a solution of the weak acid salt which reacts with water to give an alkaline solution :

C6H5CO2- + H2O = C6H5CO2H+ OH-

Ka for the acid is 6.5 x 10

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