Questions and Answers
Which compound is used as a primary standard oxidant?
Potassium Iodate
What is the approximate standard first prepared by dissolving a weight of iodine in Kl solution followed by completion to volume?
Standard I2 solution
What is the reaction of iodate with potassium iodide in a weak acid medium (0.1-1 N HCl)?
$2IO3- + 5I- + 6H^+ \rightarrow 3I2 + 3H2O$
Why is sodium thiosulphate not a primary standard?
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How is the solution of Standard I2 solution standardized?
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Study Notes
Primary Standard Oxidant
- Potassium iodate (KIO3) is used as a primary standard oxidant.
Preparation of Standard I2 Solution
- The standard I2 solution is prepared by dissolving a weighed amount of iodine in a KI solution, which is then diluted to a specific volume.
Reaction of Iodate with Potassium Iodide
- In a weak acid medium (0.1-1 N HCl), iodate reacts with potassium iodide to form iodine and water.
Sodium Thiosulphate Limitation
- Sodium thiosulphate is not a primary standard because it is not sufficiently stable and its composition can vary.
Standardization of I2 Solution
- The solution of standard I2 is standardized by titrating it against a standard thiosulphate solution.
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Description
Test your knowledge of standard solutions in chemistry with this quiz. Topics include the preparation and standardization of standard I2 solution and standard sodium thiosulphate solution.
