Student B performed a potentiometric titration using the same vinegar sample and sodium hydroxide solution. (d) Assumin

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Student B performed a potentiometric titration
using the same vinegar sample and sodium hydroxide solution.
(d) Assuming the concentration
of NaOH and ethanoic acid in vinegar are the same as in part
(b). Given the pKa of ethanoic acid is
4.76, calculate the theoretical values of initial pH and pH at
equivalent point of the titration.
Show your step-by-step working clearly and include any relevant
chemical equations.
(i) theoretical value of initial pH of acid [6
marks]
(ii) the pH value at equivalent point
of the titration. [7 marks]