CHEM 104 Experiment 4 Molarity of vitamin C Latest Update 2024-2025 Actual Exam Questions and 100% Verified Correct Answers Guaranteed A+
another name for vitamin C - CORRECT ANSWER: ascorbic acid
how does vitamin C behave in a biological system - CORRECT ANSWER: it acts as a
powerful antioxidant ( reducing agent)
how to find concentration of vitamin C in fruit drink - CORRECT ANSWER: weight of vitamin C/volume of drink x 100
how to find the weight of vitamin C used in fruit drink sample - CORRECT ANSWER: total volume of iodine solution used x 1.76 mg/mL
to mark the endpoint of the titration what indicator is used and how does it work -
CORRECT ANSWER: as vitamin c is oxidized by iodine, I2 becomes reduced to I-
.When the endpoint is reached (no vitamin c is left) the excess of I2 will react with a starch indicator to form a starch-iodine complex which is blackish blue in color
using the average concentration of vitamin C calculate the volume of fruit drink that
would satisfy the daily requirement - CORRECT ANSWER: dail req.= 60 mg
avg. concen.= 116.8mg/100 ml
60 mg x 100mL/116.8 mg = 51.4 mL
what enzyme is kept in its active form by the presence of vitamin C - CORRECT
ANSWER: prolyl hydroxylase which is essential in the synthesis of collagen
what happened to the hydrogen atoms that were present in ascorbic acid - CORRECT
ANSWER: the H atoms bonded to with iodine to form 2HI
what is the molar ratio between the ascorbic acid and the iodine - CORRECT ANSWER:
1:1
what type of reaction took place in this experiment - CORRECT ANSWER: oxidation
reduction rx
what would happen if you forgot to add HCl to the erlenmeyer flask - CORRECT
ANSWER: the reaction would've taken much longer
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