QUESTION 5 Benzoic acid, CeHCOOH is commonly used as food preservative. A buffered solution tha can maintain a pH of 4.0

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Question 5 Benzoic Acid Cehcooh Is Commonly Used As Food Preservative A Buffered Solution Tha Can Maintain A Ph Of 4 0 1 (26.48 KiB) Viewed 12 times

QUESTION 5 Benzoic acid, CeHCOOH is commonly used as food preservative. A buffered solution tha can maintain a pH of 4.00 can be prepared by using 100 mL of 0.25 M benzoic acid and 100 mL of sodium benzoate, CeHCOONa. Given the K, for benzoic acid is 6.3 x 10. a) Calculate the concentration of CeHCOONa in the solution. (Answer: x=0.1576 M) (3 marks) b) Explain qualitatively the changes of pH of the buffer solution upon the addition of 0.02 mol of potassium hydroxide, KOH. (2 marks)