sodium thiosulphate

British  

noun

1. Also called (not in technical usage): sodium hyposulphite.   hypo.  a white soluble substance used, in the pentahydrate form, in photography as a fixer to dissolve unchanged silver halides and also to remove excess chlorine from chlorinated water. Formula: Na 2 S 2 O 3

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Example Sentences

By a similar course of reasoning the conclusion is reached that the normal solution of sodium thiosulphate should contain, per liter, its molecular weight in grams.

From An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes by Talbot, Henry P.

Owing to the limited contact period available a large dosage of chlorine is employed and the excess afterwards removed by the addition of a solution of sodium thiosulphate.

From Chlorination of Water by Race, Joseph

Substances used for the removal of excess chlorine are usually known as “antichlors” and those that have been most frequently employed are sodium bisulphite, NaHSO3, and sodium thiosulphate Na2S2O3.

From Chlorination of Water by Race, Joseph

Example.—1 c.c. of the N/10 sodium thiosulphate solution is found equal to 0.0126 gramme iodine.

From The Handbook of Soap Manufacture by Simmons, W. H.

Unfortunately, the term normal is sometimes given to solutions which are strictly decinormal; for example, iodine, sodium thiosulphate, &c.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" by Various