Vitamin+C+Titration+in+fruit+juices

James Adams and Max Hommeyer

Observing as the iodine solution reacts with the lemonade to turn a purple color.

The titration is set up with iodine solution.

Making the Iodine Solution which will act as an indicator and react with the Vitamin C in the different fruit juices.


 * Abstract:

TITRATION OF FRUIT JUICES. James Adams.** The purpose of the experiment was to identify the vitamin C content in three different fruit juices: orange, apple and lemonade. The experiment involved performing a titration of three different fruit juices in order to compare the relative amounts of vitamin C. The following methods were used during this lab. First, the principle of a controlled variable was used to compare the different Vitamin C levels between the fruit juices. And second, the principle of titration was used to compare the different levels of Vitamin C content. It was essential to use an iodine solution during the titration and add both hydrochloric acid (HCL) and starch to the juices in order to indicate the level of vitamin C reacting during the lab. The results were, at a constant volume of 20 mL, the vitamin C content of orange juice was .0337 g, while the content of apple juice was .00173 g, and the content of lemonade was .000836 g. The data from the experiment proved that orange juice has a higher concentration of vitamin C compared to either apple juice or lemonade.
 * Keywords**: controlled variable, titration, Vitamin C.


 * Results:**

Table 1: Volume of iodine solution added to a dissolved vitamin C tablet in water 1.12 mL || 1.02 mL 1.00 mL || 5.5 mL 1.2 mL || 3.72 mL 1.11 mL || .96 mL 1.53 mL || 28.51 mL || 47.34 mL 49.01 mL || 50.2 mL 19.1 mL || 45.10 mL 22.91 mL || 46.23 mL 26.99 mL || Table 2: Volume of iodine solution added to Orange Juice
 * || Trial 1 (30 mL) || Trial 2 (30 mL) || Trial 3 (30 mL) || Trial 4 (20 mL) || Trial 5 (20 mL) ||
 * Mass of Vitamin C tablet || .14 g || .12 g || .09 g || .13 g || .12 g ||
 * Beginning Volume (mL) || 3.12 mL
 * End level of Iodine Solution (mL) || 50.2 mL
 * || Trial 1 (20 mL) || Trial 2 (20 mL) || Trial 3 (30 mL) ||
 * Beginning volume (mL) || 7.42 mL || 6.32 mL || 7.25 mL ||
 * First blue volume (mL) || 18.65 mL || 6.73 mL || —————— ||
 * Remains blue volume (mL) || 30.21 mL || 28.61 mL || 41.91 mL ||

Table 3: Volume of iodine solution added to Lemonade
 * || Trial 1 (20 mL) || Trial 2 (mL) || Trial 3 (30 mL) ||
 * Beginning volume (mL) || 2.89 mL || 3.41 mL || 1.12 mL ||
 * First blue volume (mL) || 3.14 mL || 3.61 mL || 1st drop ||
 * Remains blue volume (mL) || 3.41 mL || 4.01 mL || 2.91 mL ||

Table 4: Volume of iodine solution added to Apple Juice
 * || Trial 1 (20 mL) || Trial 2 (20 mL) || Trial 3 (30 mL) ||
 * Beginning volume (mL) || 4.01 mL || 5.20 mL || 2.91 mL ||
 * First blue volume (mL) || 4.21 mL || 5.31 mL || 1st droop ||
 * Remains blue volume (mL) || 5.20 mL || 6.32 mL || 4.64 mL ||

Table 5: Summary of Experiment
 * || Vitamin C water || Orange Juice || Apple Juice || Lemonade ||
 * Average Total amount of iodine solution added (mL) || 66.96 mL || 22.54 mL || 1.16 mL || .56 mL ||
 * Amount of Vitamin C in 20 mL (g) || .10 g || .0337 g || .00173 g || .000836 g ||
 * Amount of Vitamin C in 30 mL (g) || .10 g || .0449 g || .00224 g || .00232 g ||

__Research Journal Summary__: Vitamins E and C in the prevention of cardiovascular disease in men

The scientific study explores former research and older studies that suggested that Vitamin C and Vitamin E aid in the prevention of cardiovascular disease. The scientists began the experiment in 1997 set to finish in 2007. The study enrolled 14,641 American male physicians who were 50 years or older and about 5% of the subjects had prevalent cardiovascular disease. Over the course of 8 years, the subjects were given a daily dose of 500 mg of Vitamin C and 400 IU of Vitamin E. At the end of the trial, there were 1245 confirmed major cardiovascular events proving that Vitamin C had no affect on the prevention of cardiovascular disease. The experiment determined that Vitamin C and Vitamin E supplements do not aid in the prevention of cardiovascular disease in middle-aged men, proving the long-held belief to be false.

Works Cited "Vitamins E and C in the prevention of cardiovascular disease in men." //PubMed//. 12 November 2008. JAMA, Web. 7 Feb 2010. [].