1. What is Iodine Value?

Definition: The iodine value of an oil/fat is the number of grams of iodine absorbed by 100 g of the oil/fat, when determined by using Wij's solution.

Purpose: It measures the degree of unsaturation in fats and oils, which is important for quality control and nutritional analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( IV \) — Iodine Value (g iodine/100g sample)
• \( B_i \) — Blank volume of sodium thiosulphate (ml)
• \( S_i \) — Sample volume of sodium thiosulphate (ml)
• \( N_i \) — Normality of sodium thiosulphate solution (N)
• \( W \) — Sample weight (g)

Explanation: The difference between blank and sample volumes is multiplied by normality and a constant factor (1.69), then divided by sample weight.

3. Importance of Iodine Value

Details: Higher iodine values indicate more unsaturated fats. This affects properties like melting point, oxidative stability, and nutritional value.

4. Using the Calculator

Tips: Enter the blank titration volume, sample titration volume, solution normality, and sample weight. All values must be > 0 except sample volume which can be 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical iodine value for common oils?
A: Olive oil: 75-94, Coconut oil: 6-11, Soybean oil: 120-143, Linseed oil: 170-204.

Q2: Why is the blank titration higher than sample?
A: The blank measures total iodine, while the sample measures remaining iodine after reaction with unsaturated bonds.

Q3: What's the significance of the 1.69 factor?
A: It converts the iodine equivalent from the thiosulphate titration to grams iodine per 100g sample.

Q4: How precise should measurements be?
A: Very precise - use analytical balance for weight and burette for volumes to 0.01ml precision.

Q5: Can this be used for all fats/oils?
A: Yes, but very saturated fats may need modified methods as they react slowly with iodine.