Questions 1 through 3 are based on the following experiment. A chemical test for

Question

Questions 1 through 3 are based on the following experiment. A chemical test for the presence of dissolved vitamin C is that the vitamin C bleaches a dark blue solution of indophenol. A student place 1 ml of indophenol n each of six different test tubes. Then the student added a different liquid drop by drop to each test tube until the blue color of the indophenol disappeared. As indicated in the following table each liquid to a different number of drops to bleach out the blue color of the indophenol. Liquid Lemon Juice Fresh Orange juice Cooked orange juice Pineapple juice Apple juice Water Drops required 5 drops 20 drops 30 drops 30 drops 45 drops 100 drops did not bleach it 1. Which liquid had the lowest concentration of vitamin C? a. b. c. d. Fresh orange juice Cooked Orange Juice Lemon juice Apple juice According to these results when orange juice s heated it's concentration of vitamin Cis increased. True or False? Please explain with complete sentence (s) 2. Which of the following substances contained no Vitamin C when the study began? a. The indophenol solution b. The cooked orange juice c. The lemon juice d. The apple juice 3.

Explanation / Answer

1. Apple juice has lowest concentration of vitamin C, since it takes more drops to neutralize the indicator and while the other takes lower than this.

2. False. Since for fresh orange juice it takes only 20 drops while for cooked orange juice it takes 30 drops to neutralize the indicator.

i.e. as heating takes place the concentration of vitamin C decreases.

3. Indophenol solution doesn't have any vitamin C solution.

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