Chemistry Standard Solutions Quiz

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5 Questions

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?

Due to the presence of water of crystallization

How is the solution of Standard I2 solution standardized?

Against sodium thiosulphate using starch as indicator

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.

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.

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