How do you find the Mass of Vitamin C in tablet?
we did Redox Titration (Determination of ascorbic acid by Iodometric Back-Titration)
I have fillied out the data table for Standardization of 0.07 M Na2S2)3
for the determination of unknown I cannot figure out how to find the mass of vitamin c in tablet?
To find the mass of Vitamin C in a tablet using the data from your iodometric back-titration experiment, you will need to perform the following calculations:
1. Determine the volume of iodine solution required to reach the equivalent point during the titration. This is the volume of iodine solution added to react with all the ascorbic acid in your tablet.
2. Convert the volume of iodine solution used to moles. Remember to use the balanced equation for the reaction between iodine (I2) and ascorbic acid (C6H8O6) to determine the stoichiometric ratio.
3. Calculate the molar mass of ascorbic acid (C6H8O6). You can find this information in the periodic table or use online resources.
4. Use the moles of ascorbic acid calculated in step 2 and the molar mass of ascorbic acid from step 3 to find the mass of ascorbic acid in your tablet.
Here's a step-by-step breakdown of the calculations:
1. From your data table, note the volume of iodine solution (in mL) required to reach the equivalence point during the titration.
2. Convert the volume of iodine solution to moles using the molarity of your iodine solution. If your iodine solution is 0.07 M, multiply the volume (in L) by the molarity to obtain the moles of iodine solution used.
3. Use the balanced equation for the reaction between iodine and ascorbic acid:
2I2 + C6H8O6 → 2HI + C6H6O6
The stoichiometric ratio is 2 moles of iodine (I2) reacting with 1 mole of ascorbic acid (C6H8O6).
If you used "x" moles of iodine solution in the reaction, then you have x/2 moles of ascorbic acid in your tablet.
4. Calculate the molar mass of ascorbic acid (C6H8O6):
Molar mass = (6 * atomic mass of carbon) + (8 * atomic mass of hydrogen) + (6 * atomic mass of oxygen)
5. Multiply the moles of ascorbic acid obtained in step 3 by the molar mass of ascorbic acid calculated in step 4 to find the mass of ascorbic acid (Vitamin C) in your tablet.
Remember to use proper units and significant figures throughout your calculations.