A sample of fresh grapefruit juice was filtered and titrated with the I2 solution prepared in Part 2. A 100.0 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch end point.
What is the concentration of Vitamin C in 100ml juice?
What quantity of juice will privide the RDA amount of vit C?
I don't now anything about part A.
Grams vitamin C in the 100 mL =
Liodine x Miodine x (1 mol I2/1 mol vit C) x molar mass vit C = grams vit C.
You can take the concn from there and look up the RDA value and calculate that form the concn.
To determine the concentration of Vitamin C in the grapefruit juice, we can use the information provided about the volume of iodine solution required during titration.
First, let's calculate the concentration of iodine solution. We need to know the molarity of the iodine solution to determine the concentration of Vitamin C.
Next, we'll use the stoichiometry of the reaction between iodine and Vitamin C to calculate the moles of Vitamin C in the 9.85 mL of iodine solution.
Finally, we can calculate the concentration of Vitamin C in the grapefruit juice.
1. Calculate the concentration of iodine solution:
- Assuming the iodine solution is prepared with a known molarity, let's label it as M_I2.
- We know that 9.85 mL of the iodine solution is required for the titration with 100.0 mL of the grapefruit juice. This is the volume (V_I2) of the iodine solution used.
- Using the formula for concentration (C = n/V), we can calculate the concentration of the iodine solution (C_I2):
C_I2 = (M_I2 * V_I2) / V_Juice
Here, V_Juice represents the volume of the grapefruit juice used during the titration (100.0 mL).
2. Calculate the moles of Vitamin C:
- We know that the stoichiometry of the reaction is such that 1 mole of Vitamin C reacts with 1 mole of iodine.
- Therefore, the moles of Vitamin C (n_VitaminC) can be calculated as:
n_VitaminC = n_I2
(Since 1 mole of Vitamin C reacts with 1 mole of iodine)
3. Calculate the concentration of Vitamin C in the grapefruit juice:
- We need to find the moles of Vitamin C in the 100.0 mL of grapefruit juice.
- Using the formula for concentration (C = n/V), we can calculate the desired concentration (C_VitaminC):
C_VitaminC = n_VitaminC / V_Juice
To calculate the quantity of grapefruit juice needed to provide the Recommended Daily Allowance (RDA) amount of Vitamin C, we need to know the RDA value for Vitamin C and the concentration of Vitamin C in the juice.
4. Calculate the quantity of juice for RDA amount of Vitamin C:
- Multiply the concentration of Vitamin C by the desired quantity of Vitamin C (RDA):
Quantity of juice = C_VitaminC * RDA
Please note that the molarity of the iodine solution and the RDA value for Vitamin C are not provided in the given question. You will need to obtain those values from the specific experiment or literature to get an accurate result.
To calculate the concentration of Vitamin C in 100 mL of juice, we need to determine the amount of iodine consumed during the titration.
1. The volume of iodine solution used: 9.85 mL
2. Convert the volume of iodine solution to liters: 9.85 mL = 0.00985 L
3. Since the stoichiometric ratio of iodine to Vitamin C is 1:2, the moles of iodine used are half the moles of Vitamin C.
4. Calculate the moles of iodine used: moles of I2 = 0.00985 L x molarity of I2 solution
5. To find the moles of Vitamin C, multiply the moles of iodine by 2 (since the stoichiometry is 1:2).
6. Calculate the moles of Vitamin C: moles of Vitamin C = 2 x moles of I2
7. Now, determine the mass of Vitamin C in the 100 mL of juice.
- The molar mass of Vitamin C (ascorbic acid) is 176.12 g/mol.
- Calculate the mass of Vitamin C: mass of Vitamin C = moles of Vitamin C x molar mass of Vitamin C
8. Calculate the concentration of Vitamin C in the juice:
- Concentration (in g/L) = mass of Vitamin C / 0.100 L (since we have 100 mL of juice)
- Concentration (in mg/mL) = concentration (in g/L) x 1000
To calculate the quantity of juice required to provide the Recommended Daily Allowance (RDA) of Vitamin C, we need to know the RDA amount. The RDA for Vitamin C varies depending on the age and sex of an individual. Please provide the RDA amount, and I can help you calculate the required quantity of juice.