20 ml of Ascorbic acid solution be transferred to conical flask then drops of starch (1% as indicator prepared by heating until dissolving then cooled). Iodine solution 0.1% was first prepared in Potassium iodide 1% then the normality of iodine solution should be measured with standard thiosulphate solution using starch indicator solution mentioned.

Titration of Ascorbic acid solution was proceeded by the prepared-standardized iodine solution until the first appearance of Blue color stable for 30 seconds.

Calculation: Volume of iodine (ml) X Normality of iodine solution = Volume of Ascorbic acid X Normality of ascorbic

i.e: V x N (Iodine) = V' x N' (Ascorbic)

Buirrete known = 20 be calculated

Weight of Ascorbic (g) per liter = V x N x Equivalent weight

= volume/L x Normality of ascorbic x Equivalent weight (Molecular weight /2) of ascorbic acid

Wt (g)/L = 1 x N (calculated from previous equation) x 176/2

What is the goal of your investigation?

Dear Colleague,

I hope this message finds you well. Calculating the expected volume of iodine required in an ascorbic acid redox titration involves understanding the stoichiometry of the reaction and the concentrations of the reactants. Below is a detailed and logical explanation of the process.

Ascorbic Acid Redox Titration with Iodine

Reaction Stoichiometry

The redox reaction between ascorbic acid (C₆H₈O₆) and iodine (I₂) in an acidic medium is as follows:

C6H8O6+I2→C6H6O6+2I−+2H+\text{C}_6\text{H}_8\text{O}_6 + \text{I}_2 \rightarrow \text{C}_6\text{H}_6\text{O}_6 + 2\text{I}^- + 2\text{H}^+C6​H8​O6​+I2​→C6​H6​O6​+2I−+2H+

From the balanced equation, we can see that one mole of ascorbic acid reacts with one mole of iodine.

Calculation Steps

Example Calculation

Suppose we have the following:

• Concentration of ascorbic acid solution: 0.05 M
• Volume of ascorbic acid solution: 25 mL (0.025 L)
• Concentration of iodine solution: 0.02 M

Therefore, 62.5 mL of 0.02 M iodine solution is required to titrate 25 mL of 0.05 M ascorbic acid solution.

Conclusion

The calculation of the expected volume of iodine required in an ascorbic acid redox titration involves determining the moles of ascorbic acid, using the stoichiometry of the reaction to find the moles of iodine needed, and then calculating the corresponding volume of the iodine solution. This approach ensures accurate and reliable titration results.

Should you have any further questions or require additional assistance, please feel free to reach out.

Best regards,

l Take a look at this protocol list; it could assist in understanding and solving the problem.