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HYPOSULPHITE OF SODA
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HYPOSULPHITE OF SODA, the name originally given to the substance known in chemistry as sodium thiosulphate, Na2S2Oa ; the earlier name is still commonly used, especially by photographers, who employ this chemical as a fixer. In systematic chemistry, sodium hyposulphite is a salt of hyposulphurous acid, to which Schutzenberger gave the formula H2SO2, but which Bernthsen showed to be H2S_04. (See SULPHUR.)