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

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sodium thiosulphate

The substance is called sodium thiosulphate, and is a salt of the easily decomposed acid H2S2O3, called thiosulphuric acid.

From An Elementary Study of Chemistry by McPherson, William

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

Try to dissolve the other half in Na2S2O3, sodium thiosulphate solution.

From An Introduction to Chemical Science by Williams, Rufus Phillips

The titration of iodine against sodium thiosulphate, with starch as an indicator, may perhaps be regarded as the most accurate of volumetric processes.

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

One c.cm. of N/1000 sodium thiosulphate = 0.07 p.p.m. of available chlorine when 500 c.cms. of water are used.

From Chlorination of Water by Race, Joseph