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Questions and Answers
Which compound is used as a primary standard oxidant?
Which compound is used as a primary standard oxidant?
- Potassium Iodate (correct)
- Iodine
- Sodium dichromate
- Sodium thiosulphate
What is the approximate standard first prepared by dissolving a weight of iodine in Kl solution followed by completion to volume?
What is the approximate standard first prepared by dissolving a weight of iodine in Kl solution followed by completion to volume?
- Standard sodium thiosulphate
- Potassium Iodate
- Sodium dichromate solution
- Standard I2 solution (correct)
What is the reaction of iodate with potassium iodide in a weak acid medium (0.1-1 N HCl)?
What is the reaction of iodate with potassium iodide in a weak acid medium (0.1-1 N HCl)?
- $IO3- + I^- \rightarrow I3^-$
- $IO3- + 6H+ + 6e^- \rightarrow 3H2O + I$
- $2IO3- + 5I- + 6H^+ \rightarrow 3I2 + 3H2O$ (correct)
- $IO3- + 6H+ + 4e^- \rightarrow 3H2O + I^+$
Why is sodium thiosulphate not a primary standard?
Why is sodium thiosulphate not a primary standard?
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How is the solution of Standard I2 solution standardized?
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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