sodium bisulfate

noun also sodium acid sulfate

: a crystalline salt NaHSO₄ that gives an acid reaction in solution, that is usually made by the reaction of sulfuric acid with common salt or sodium sulfate, and that is used chiefly as a flux in pickling metals and as an acid ingredient in dyeing and cleaning compositions; sodium hydrogen sulfate — called also niter cake

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Chem.

a colorless crystalline compound, NaHSO₄, soluble in water: used in dyeing, in the manufacture of cement, paper, soap, and an acid-type cleaner. Also called sodium hydrogen sulfate.

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sodium bisulfate,

a crystalline or white granular salt, used as a strong acid in dyeing, in the manufacture of paper, glue, soap, and perfume, as a disinfectant, and as a flux for decomposing metals. Formula: NaHSO₄