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

HCl and 1 c.cm. of starch solution and titrate with N/1000 sodium thiosulphate until colourless.

From Chlorination of Water by Race, Joseph

Weigh out 25 grams of sodium thiosulphate, dissolve it in water which has been previously boiled and cooled, and dilute to 1000 cc., also with boiled water.

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

After the addition of 0.5 grm. of pure sodium, thiosulphate, the contents of the dish, is well stirred for two and a half minutes.

From Nitro-Explosives: A Practical Treatise by Sanford, P. Gerald (Percy Gerald)

The amount of iodine liberated is therefore a measure of the copper in the solution, and when the sodium thiosulphate has been carefully standardized the method is extremely accurate.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" by Various

The purity of the compound can be ascertained by dissolving in glacial acetic acid, adding potassium iodide, and titrating with thiosulphate; 0.1 gram should require 14.8 to 14.9 c.cms. of N/10 sodium thiosulphate.

From Chlorination of Water by Race, Joseph