Chemistry > EXAM > CHEM 104 Experiment 4: Molarity of Vitamin C - Portage Learning (All)

Also available in bundle ( Click Here )

CHEM 104 Experiment 4: Molarity of Vitamin C - Portage Learning

Document Content and Description Below

CHEM 104 Experiment 4: Molarity of Vitamin C - Portage Learning Purpose: The purpose of this lab is to determine a better understand of solutions and concentrations relating to vitamins, specifically... vitamin C or ascorbic acid. In order to do so, we measured the vitamin C in a few different fruits to determine the concertation of vitamin c in each. Procedure: Part 1: Determining the vitamin c concentration of iodine 1. Iodine was placed in a buret. 2. A solution was made from the commercial vitamin C by weighing out 0.465 g on a balance scale, ensuring to tare (zero) the balance after added the weigh paper. 3. The vitamin C was them placed in a volumetric flask & 250 mL of H2O was added, swirling to mix & ensure that it is all dissolved. 4. Molarity of vitamin c was calculated 5. Next, we poured a 10 mL solution of 0.1 mol vitamin C into a graduated cylinder. 6. 2-3 drops of acetic acid and starch were added. 7. We anticipate the endpoint color to be purple 8. Iodine was slowly added from the buret, remember to swirl occasionally. 9. This was continued until the purple colored solution was established 10. Moles of iodine = moles of vitamin c titrated 11. The concentration of iodine was then calculated Part 2: Determining the vitamin c concentration in orange juice 1. Prepare 20 mL of orange juice & place into a graduated cylinder 2. 30 mL of orange juice was added to make a total of a 50 mL solution, in doing so the solution is more dilute but it is more visible so we can determine the endpoint more accurately 3. 2-3 drops of acetic acid and starch were added 4. Iodine was slowly added from the buret, remember to swirl occasionally. [Show More]

Last updated: 1 year ago

Preview 1 out of 3 pages

Buy Now

Instant download

We Accept: