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Organic acids, including vitamin C (ascorbic acid), are present in lemon juice - VCE - SSCE Chemistry - Question 26 - 2018 - Paper 1
Question 26
Organic acids, including vitamin C (ascorbic acid), are present in lemon juice. Since organic acids and vitamin C are weak acids, they will undergo acid-base reactio... show full transcript
Worked Solution & Example Answer:Organic acids, including vitamin C (ascorbic acid), are present in lemon juice - VCE - SSCE Chemistry - Question 26 - 2018 - Paper 1
Step 1
an acid-base titration with potassium hydroxide and phenolphthalein indicator, and a redox titration with iodine and a starch indicator
Answer
This method is appropriate because the acid-base titration will accurately determine the concentration of the organic acids using phenolphthalein as an indicator. The redox titration will effectively quantify the vitamin C content in the sample, utilizing iodine and a starch indicator to observe the endpoint of the reaction. This combination allows for a clear distinction between the acid-base and redox properties present in the sample.