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  (Organic Chemistry)

Sodium Bisulfate

Other Names:

Sodium hydrogen sulfate

General Information:


CAS Number: 7681-38-1 (anhydrous)

    10034-88-5 (monohydrate)

Molecular Weight: 120.06 g/mol (anhydrous)

    138.07 g/mol (monohydrate)

Appearance: White solid (anhydrous)

    White solid (monohydrate)

Chemical Formula: NaHSO4 (anhydrous)

    NaHSO4-H2O (monohydrate)

Acidity (pKa): 1.99

Sodium bisulfate (NaHSO4) is available in anhydrous form and as a monohydrate. Anhydrous sodium bisulfate is hygroscopic. Sodium bisulfate is generally used to adjust the pH of a solution.

Common Uses:

Acid used to lower pH

Procedure excerpt:

. . . The resulting mixture was allowed to warm to RT for 2.5 h, after which time it was diluted with H2O and acidified to pH 2.5 using 1M NaHSO4 . . .

[full procedure]


1) Patent Reference: WO2012069948, page 78, (3.9 MB)

2) Wikipedia: Sodium bisulfate (link)

3) Sodium hydrogen sulfate (link)