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Why is sodium thiosulphate used in iodometric titration?
· In analytical chemistry, sodium thiosulphate is used for the determination of the strength of a given solution of iodine. · Sodium thiosulphate is preferred in iodometric analysis due to the fact that sodium thiosulphate is oxidized by iodine. It is also used to determine the strength of many oxidizing agents.
Why blue colour of an iodine solution dischargers when sodium thiosulphate aded?
When sodium thiosulfate is added to an iodine solution, a reaction occurs where iodine is reduced to iodide ions by thiosulfate, causing the blue color to disappear. This is due to the formation of a colorless complex between iodine and thiosulfate, resulting in a color change.
Is there a reaction between astatine and sodium iodine solution?
Yes, astatine can react with sodium iodine solution to form sodium astatide and iodine gas. This reaction is a displacement reaction where astatine displaces iodine from the sodium iodine solution.
What is the word equation of sodium iodine?
The word equation for the reaction between sodium and iodine is: sodium + iodine → sodium iodide.
Why is starch indicator added after sodium thiosulphate?
Starch indicator is added after sodium thiosulphate in iodometric titrations to help visualize the endpoint of the reaction. Starch reacts with any excess iodine produced at the endpoint, forming a dark blue-black color, allowing for easier detection of when all the thiosulphate has reacted.
What is the use of Sodium thiosulphate in iodometry?
In iodometry sodium thiosulphate is used because it is standardized by potassium dichromate and it is the best and relaible way to standardized sodium thiosulphate using iodometric titration. Infact sodium thiosulphate is also standardized by iodimetry. The difference between both of them is only of iodine. In iodometry iodine gas is liberated that will further react with sodium thiosulphate but in iodimetry standard solution of iodine is used.
Why do you use starch to standardise sodium thiosulphate using potassium iodate?
Starch acts as an indicator for the endpoint of the reaction between sodium thiosulphate and potassium iodate, as it forms a blue-black complex with iodine. This color change helps identify when all the iodine has been liberated from the reaction. This method is commonly used in titrations to determine the concentration of the sodium thiosulphate solution accurately.
Why is sodium thiosulphate used in iodometric titration?
· In analytical chemistry, sodium thiosulphate is used for the determination of the strength of a given solution of iodine. · Sodium thiosulphate is preferred in iodometric analysis due to the fact that sodium thiosulphate is oxidized by iodine. It is also used to determine the strength of many oxidizing agents.
Why blue colour of an iodine solution dischargers when sodium thiosulphate aded?
When sodium thiosulfate is added to an iodine solution, a reaction occurs where iodine is reduced to iodide ions by thiosulfate, causing the blue color to disappear. This is due to the formation of a colorless complex between iodine and thiosulfate, resulting in a color change.
Is there a reaction between astatine and sodium iodine solution?
Yes, astatine can react with sodium iodine solution to form sodium astatide and iodine gas. This reaction is a displacement reaction where astatine displaces iodine from the sodium iodine solution.
What is the word equation of sodium iodine?
The word equation for the reaction between sodium and iodine is: sodium + iodine → sodium iodide.
Equation between potassium iodate and sodium thiosulphate?
The equation between potassium iodate (KIO3) and sodium thiosulfate (Na2S2O3) involves a redox reaction. In the presence of an acid, potassium iodate is reduced to iodine (I2), while sodium thiosulfate is oxidized to form sodium tetrathionate (Na2S4O6). The balanced chemical equation for this reaction is 5Na2S2O3 + 2KIO3 + 8HCl → 5Na2S4O6 + 2I2 + 2KCl + 6H2O.
Why is starch indicator added after sodium thiosulphate?
Starch indicator is added after sodium thiosulphate in iodometric titrations to help visualize the endpoint of the reaction. Starch reacts with any excess iodine produced at the endpoint, forming a dark blue-black color, allowing for easier detection of when all the thiosulphate has reacted.
Why use sodium Bicarbonate for titration of sodium thiosulphate using pottasium dicromate?
because sodium thiosulphate is unstable and iodine also so to maintain neutral medium we have to use sodiumcarboate
In the reaction of sodium thiosulphate and iodine in aqueous medium the equivalent weight of sodium thiosulphate is equal to what?
The equivalent weight of sodium thiosulfate in the reaction with iodine is equal to its molar mass divided by the change in oxidation state of sulfur during the reaction. Since sulfur in thiosulfate changes from +6 to +2 during the reaction, the equivalent weight would be the molar mass of thiosulfate divided by 4.
Will there be a reaction between astatine and sodium iodide solution?
Yes, there will be a reaction between astatine and sodium iodide solution. Astatine is a halogen like iodine and can displace iodine in sodium iodide forming astatide. This reaction is similar to how chlorine displaces bromine in sodium bromide.
Why is sulfuric acid added to the dilute bleach and iodide in the conical flask during titration of sodium hypochlorite with sodium thiosulphate?
Sulfuric acid is added to the bleach and iodide solution to acidify the solution and promote the reaction between hypochlorite and iodide to produce iodine. The iodine produced is then titrated with sodium thiosulfate to determine the concentration of hypochlorite in the sample. Acidifying the solution helps in stabilizing the generated iodine for a more accurate titration.
