Focus; and in the path of the light is placed a glass beaker containing a dilute solution of sodium thiosulphate (hyposulphite of soda).
The hyposulphite experiment here again affords an excellent illustration.
By acting upon a solution of sodium hyposulphite with potassium bisulphate, Gernez (Compt.
Rend., 1891, 112, p. 866) is obtained by mixing a solution of sodium hyposulphite with double its volume of hydrochloric acid, filtering and extracting with chloroform; the extract yielding the variety on evaporation.
HYPOSULPHITE OF SODA, the name originally given to the substance known in chemistry as sodium thiosulphate, Na 2 S 2 O 3; the earlier name is still commonly used, especially by photographers, who employ this chemical as a fixer.
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