Iodine Solution Preparation
- Dissolve about 14 g of iodine in a solution of 36 g of potassium iodide in 100 ml of water.
- Add three drops of hydrochloric acid and dilute with water to 1000 ml.
- Standardize the solution in the following manner.
Iodine Solution Standardization
- Weigh accurately about 0.15 g of arsenic trioxide, previously dried at 105° for 1 hour.
- Dissolve in 20 ml of 1M sodium hydroxide by warming, if necessary.
- Dilute with 40 ml of water, add 0.1 ml of methyl orange solution and add dropwise dilute hydrochloric acid until the yellow color is changed to pink.
- Add 2 g of sodium carbonate, dilute with 50 ml of water and add 3 ml of starch solution.
- Titrate with the iodine solution until a permanent blue color is produced.
- Store in amber-colored, glass-stoppered bottles.
- 1 ml of 0.05 M iodine is equivalent to 0.004946 g of As2O3.
- Calculate the molarity of solution by the following formula:
M = ----------------------------
Iodine in ml x 4.946
Also see: Determination of Shelf Life of Solutions in Laboratory
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