Question

Calculate the mass of ascorbic acid that was protected by the presence of the oxalic acid

Answer 1

The calculation provided is not for the mass of ascorbic acid protected by oxalic acid, but rather the determination of ascorbic acid concentration in an orange juice sample using iodine and sodium thiosulfate in a redox titration method.

Step-by-step explanation:

You're asking how to calculate the mass of ascorbic acid that was protected by the presence of oxalic acid. However, based on the provided details, the calculation appears to be more about determining the concentration of ascorbic acid in an orange juice sample using a redox titration method with iodine (I3-) and sodium thiosulfate (Na2S2O3). To find the mass of ascorbic acid originally present, you would subtract the moles of I3- that reacted with Na2S2O3 from the total moles of I3- added, and then use this difference to calculate the moles of ascorbic acid that reacted. This is then converted to mass using ascorbic acid's molar mass.

The key steps are to determine moles of I3- reacting with Na2S2O3, subtract to find moles of I3- that reacted with ascorbic acid, and finally calculate the mass of ascorbic acid using its molar mass of 176.13 g/mol. In the example provided, the result was 2.43 mg of ascorbic acid in a 5.00 mL sample, equivalent to 48.6 mg per 100 mL of orange juice.

Answer 2

To calculate the mass of ascorbic acid protected by the presence of oxalic acid, we need to know the mass of oxalic acid and use the balanced chemical equation.

Step-by-step explanation:

To calculate the mass of ascorbic acid protected by the presence of oxalic acid, we need the molar mass of ascorbic acid and the molar mass of oxalic acid. Let's assume the molar mass of ascorbic acid is 176 g/mol and the molar mass of oxalic acid is 90 g/mol.

If we know the mass of oxalic acid in the solution, we can calculate the number of moles of oxalic acid using its molar mass. Then, using the balanced chemical equation between ascorbic acid and oxalic acid, we can determine the moles of ascorbic acid. Finally, we can calculate the mass of ascorbic acid in grams by multiplying the moles by its molar mass.

It is important to have the mass of oxalic acid to proceed with the calculation, as the presence of oxalic acid protects the ascorbic acid.