bisulphite

/ baɪˈsʌlfaɪt /

noun

a salt or ester of sulphurous acid containing the monovalent group -HSO 3 or the ion HSO 3 ^–
modifier consisting of or containing the group -HSO 3 or the ion HSO 3 ^–
bisulphite ion

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The cyanide and bisulphite solution is then added with warming till the blue colour is destroyed.

Bisulphite of soda has also often been used as the reducing agent.

Sulphurous acid may either be applied in the gaseous form or in solution as bisulphite of soda.

Wool may also be bleached by steeping in a fairly strong solution of bisulphite of soda and then washing well in water.

If the alumina solution gives a red or yellow solution without fluorescence, add to it concentrated sodium bisulphite.

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