Based on the results of your fine titration, how many mg of ascorbic acid are in

Question

Based on the results of your fine titration, how many mg of ascorbic acid are in 40 mL of fresh orange juice? The molar mass of ascorbic acid is 176.12 g/mol. Choose the closest answer.

A. 10 B. 60 C. 37 D. 18

These are the results of my fine filtration:

For each of the fresh orange juice titrations, calculate and record the following data. If you had to perform the fine titration three times, discard the volume that is different. Record volumes using all the digits provided by the lab even if they are zero.

Coarse Titration Fine Titration #1 Fine Titration #2 volume of I2 dispensed (mL) 50 mL 50 mL 50 mL moles of I2 0.00010451 0.0001001 0.0001003 moles of ascorbic acid based on the reaction stoichiometry 0.00010451 0.0001001 0.0001003 molarity of ascorbic acid in orange juice (mol/L) 0.00261275 0.002502 0.002507 average molarity of I2 using the fine titrations (mol/L) 0.0026 0.00250

Explanation / Answer

According to fine titration molarity of ascorbic acid in orange juice =0.002502 M = 0.002502 moles/1000mL

So, moles of ascorbic acid present in 40 mL of orange juice = 0.002502 moles*40mL/1000mL = 0.10008*10^-3 moles

mass of ascorbic acid present = 0.10008*10^-3 moles*176.12gm/mol = 0.01762 g = 17.62 mg ~18

Correct answer :D

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