Bisulphate

• (n.) A sulphate in which but half the hydrogen of the acid is replaced by a positive element or radical, thus making the proportion of the acid to the positive or basic portion twice what it is in the normal sulphates; an acid sulphate.
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Bisulphate

Bi·sul'phate noun [ Prefix bi- + sulphate .] (Chemistry) A sulphate in which but half the hydrogen of the acid is replaced by a positive element or radical, thus making the proportion of the acid to the positive or basic portion twice what it is in the normal sulphates; an acid sulp...
Found on http://www.encyclo.co.uk/webster/B/58
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