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Sodium thiosulfate is not considered a primary standard because its purity can be affected by oxidation upon exposure to air, making it difficult to accurately determine its concentration. Additionally, it is hygroscopic, meaning it can absorb moisture from the atmosphere, further affecting its purity and concentration over time.

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1y ago

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Is sodium thiosulphate solution a primary standard?

No, sodium thiosulfate solution is not typically considered a primary standard. It is commonly used as a titrant in redox titrations rather than as a primary standard due to its susceptibility to oxidation by air. Primary standards are typically pure, stable compounds that can be used to standardize solutions.


0.1N Sodium Thiosulphate is primary or secondary solutions?

it is a secondary solution because it can change its concentration by absorbing moisture....


What color is Sodium Thiosulphate?

Sodium thiosulphate is typically white in color, appearing as a crystalline powder or solid.


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 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


What is a bromin?

Sodium thiosulphate solution (5-25 %)


Indicator used during the standardization of sodium thiosulphate?

Starch


What is the boiling point of sodium thiosulphate?

The boiling point of sodium thiosulphate is 100 degrees Celsius, the same as water.That would be 212 degrees Fahrenheit.


What does sodium thiosulphate and hydrochloric acid react to form?

sodium chloride, sulphur, sulphur dioxide and water


Is sodium thiosulphate conductive?

Sodium thiosulfate is not conductive because it does not dissociate into ions in solution. It is a non-electrolyte.


What is the chemical symbol for sodium thiosulphate?

The chemical symbol for sodium thiosulphate (hypo) is Na2S2O3•5H2O.


Is k2cro4 a primary or secondary standard and why?

K2CrO4 is a secondary standard. This is because it is not directly titrated against a primary standard but rather is standardized by titration against a primary standard, such as sodium thiosulfate in iodometric titrations.