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Q: Why is sodium thiosulphate not considered as a primary standard?
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Is sodium thiosulphate solution a primary standard?

No. because it contains water of crystallization so it can absorb or release water..


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.


0.1N Sodium Thiosulphate is primary or secondary solutions?

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


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.


What is the reaction of sodium sulphite and sulphur?

sodium thiosulphate


Is sodium thiosulphate a reactant?

naaa then


What is the difference between sodium sulphate and sodium thiosulphate?

The polyatomic anions in sodium sulphate have the formula SO4-2, while the polyatomic anions in sodium thiosulphate have the formula S2O3-2.


Is sodium thiosulphate an acid or a base?

Sodium thiosulphate is a somewhat strong acid with pKas of 0.6 and 1.7 for the first and second dissociation respectively.


What color is Sodium Thiosulphate?

It is a colourless crystal.


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.


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


Why sodium thiosulphate is called hypo?

Because it used to be called Sodium hyposulphite.