Answer to Question #59840 in General Chemistry for Brandon

Question

Sodium benzoate, NaC7H502 (the numbers here are subscripts) , is used as a preservative in foods. Consider a 50.0-mL sample of 0.250 MNaC7H502 being titrated by 0.200 M HBr. Calculate the pH of the solution: (A) when no HBr has been added; (B) after the addition of 50.0 ml-a of the HBr solution; (C) at the equivalence point; (D) after the addition of 75.00 mL of the HBr solution. The -10Kb value for the benzoate ion is 1.6 X 10 to the -10th power.