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Photographic fixing agent. An emulsion of sodium thiosulfate (called hypo by photographers) is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.

S2O32- + AgBr(s) AgS2O3- + Br-

S2O32- + AgS2O3- Ag(S2O3)23-

  • Thiosulfate is also an antidote for cyanide poisoning. It reacts with cyanide to produce sulfite and thiocyanate ions:

CN- + S2O32- SCN- + SO32-This reaction is catalyzed by an enzyme produced by cell mitochondria to neutralize small quantities of ingested cyanide (which occurs naturally in cassava root, lima beans, and almonds!).

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Q: Is sodium thiosulphate used in photography?
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Why is hypo used in photography?

Hypo is used in photography it is a solution of Sodium thio sulphate, Na2S2O3


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 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 sodium thiosulphate is called hypo?

Because it used to be called Sodium hyposulphite.


Indicator used during the standardization of sodium thiosulphate?

Starch


Why sodium carbonate is used in preparation of thiosulphate solution?

To ensure the stability of the solution


What is the reaction of sodium sulphite and sulphur?

sodium thiosulphate


Is sodium thiosulphate a reactant?

naaa then


Which of the following is used as food preservative 1 sodium Benzoate 2 sodium Thiosulphate 3 sodium Hydroxide 4 sodium Bicarbonate?

1.sodium benzoate


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.


What is sodium thiosulphate capable of?

Sodium thiosulfate is used against cyanide poisoning and pitiryazis.For nonmedical uses see this link.


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.