What is salt Thiosulfate?

Sodium thiosulfate, i beg your pardon is likewise referred to as sodium sulphate, is a chemical link that has the formula Na2S2O3.

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It is frequently found in the pentahydrate form which is one of two people white in colour, or colourless altogether. This pentahydrate of salt thiosulfate is defined by the following chemical formula: Na2S2O3.5H2O.

In its heavy form, the is a crystalline heavy which has a tendency to readily lose water. Salt thiosulfate is readily soluble in water and is also described as salt hyposulfite. The structure of the Na2S2O3 molecule is portrayed below.


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Sodium Thiosulfate Structure


It can be listed that the shape of the thiosulfate ion is tetrahedral in the solid-state of sodium thiosulfate. The distance between the two sulphur atom in the thiosulfate ion is comparable to the distance in between two sigma bonded sulphur atoms. This implies that the sulphur i beg your pardon is no bonded to any type of oxygens hold a an unfavorable charge.

Properties of salt Thiosulfate

The physical and also chemical nature of Na2S2O3 are detailed below.

1. Physics Properties

In the anhydrous form, sodium thiosulfate has actually a molar mass of 158.11 grams per mole. The an ext commonly obtainable pentahydrate from, Na2S2O3.5H2O has actually a molar mass of 248.18 g/mol.It has a white, crystalline appearance as a solid and also is odourless.The density of salt thiosulfate synchronizes to 1.667 grams per cubic centimetres.The pentahydrate the this salt has actually a melting point of 321.4 K and also a boiling allude of 373 K.The crystal framework of Na2S2O3 crystals is monoclinic.

2. Chemistry Properties

The sodium thiosulfate salt is neutral in charge. However, that dissociates in water and some various other polar solvents to yield Na+ and S2O32-Despite being steady at standard conditions, the salt thiosulfate salt decomposes in ~ high temperatures to yield salt sulfate together with sodium polysulfide.The chemical equation for the reaction described over is provided by

4Na2S2O3 ⟶ 3Na2SO4 + Na2S5

When exposed come dilute acids such together dilute hydrochloric acid, the salt thiosulfate salt experience a decomposition reaction to productivity sulphur together with sulphur dioxide.

Na2S2O3 + 2HCl ⟶ 2NaCl + SO2 + H2O + S

The alkylation the Na2S2O3 returns S-alkyl thiosulfates. This compounds are typically referred to together Bunte salts.

Important Questions

Comment ~ above the solubility of salt thiosulphate

Sodium thiosulphate is a colourless monoclinic decision or a crystalline white powder which is odourless and salty. The relative thickness for this is 1.667. Water-soluble, that solubility in ~ 100° C is 231 g/100 ml the vapour. Insoluble in spirits.

Is sodium thiosulphate harmful?

Acute potential health effects of sodium thiosulphate are provided below.

Skin: This link may cause mild skin irritation.Eyes: This link can reason mechanical eye irritation.Inhalation: sodium thiosulphate can reason upper respiratory tract and also mucous membrane irritation.Ingestion: this compound is an agent v a low order the toxicity.

How does sodium thiosulphate react with hydrochloric acid?

When reacted with dilute hydrochloric acid, salt thiosulphate provides sulphur dioxide, water, and also sulphur as the product.

Production of sodium Thiosulfate

The laboratory preparation of the salt thiosulfate salt involves the heater of aqueous salt sulfite solutions in addition to sulphur.The reaction because that the method described above is offered by

6NaOH + 4S ⟶ Na2S2O3 + 2Na2S + H2O.

Industrially, sodium thiosulfate is ready from the liquid waste generated from the to produce of sulphur dye.

It can be listed that upon heating v Al3+ containing samples, salt thiosulfate gives a white-colored precipitate. This is due to the reaction in between the aluminium cation and also the thiosulfate anion which creates aluminium hydroxide together with sulphur and sulphur dioxide.

Uses of salt Thiosulfate

Some necessary uses of salt thiosulfate are noted below.

Na2S2O3 is a really important chemical link in the medical treatment of cyanide poisoning cases.Sodium thiosulfate is also used medically to act dermatophytosis (ringworm) and also tinea versicolor.The side effects of chemotherapy and also hemodialysis (purification the blood) room treated with Na2S2O3.It is a very important link in analysis chemistry since it stoichiometrically reacts through iodine to alleviate it to the iodide ion while that is oxidized to the S4O62- (tetrathionate) ion.Sodium thiosulfate salt are offered as photographic fixers because of the capacity of the thiosulfate ion to react with silver halides, which make up photographic emulsions.Ammonium thiosulfate and also sodium thiosulfate make up lixiviants (liquid mediums provided in hydrometallurgy) which are supplied in the exploit of yellow from the ores.In bespeak to mitigate the chlorine level in water bodies, Na2S2O3 is used in the dechlorination process.

Medical supplies of sodium Thiosulfate

Sodium thiosulfate, commonly known as salt thiosulphate, is a medication that is offered to act cyanide poisoning, pityriasis versicolor, and also cisplatin next effects. It is commonly used ~ the drug sodium nitrite for cyanide poisoning and is usually only prescribed in significant situations.Sodium Thiosulfate is a toxin through a modest toxicity level. Big dosages may develop nausea, vomiting, abdominal muscle cramps, diarrhoea, metabolic acidosis, and hypernatremia, and also gastrointestinal discomfort.


Sodium thiosulfate is an not natural sodium salt created of 2:1 mixture the sodium and thiosulfate ions. It has actually a function as a cyanide poisoning antidote, a nephroprotective agent, and an antimicrobial product.


The normality the a solution is same to the number of equivalents multiplied by the molarity. Standard(N) = Molarity(M) x tantamount number. That is characterized as the gram weight identical of the systems per liter.


The hydrochloric acid systems is eye and skin corrosive. Via absorption and inhalation, the is mildly toxic. Salt thiosulfate systems is one irritant come the body’s skin. Sulphur dioxide gas, skin, and eye irritant are created by the reaction of salt thiosulfate and also hydrochloric acid.


The weight equivalent is the gram molecular weight divided by the variety of electrons shed or obtained by each molecule; this is (248.17/1) g for salt thiosulfate (Na2S2O3.5H2O).

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Thiosulfate ion (S2O3-2) is a moderately solid reducing agent supplied by an indirect procedure in i m sorry iodine is an intermediate agent to determine oxidizing agents. Starch irreversibly decomposes in solutions containing high levels of iodine.