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CAS number: 7681-38-1, 10034-88-5 (monohydrate)
PubChem: 516919
ChemSpider: 56397
EC Number: 231-665-7
RTECS number: VZ1860000
Acid (pKa): 1.99
Structure: Crystal structure
Molecular formula: NaHSO4
Molar mass: 120.06 g / mol (anhydrous) 138.07 g / mol (monohydrate)
Appearance: White solid
Density: 2.742 g / cm3 (anhydrous) 1.8 g / cm3 (monohydrate)
Melting point: 58.5 [deg.] C. (anhydrous) 315 [deg.] C. (anhydrous)
Boiling point: decomposes for Na2S2O7 ( H2O) at 315 ° C
Solubility in water: 50 g / 100 ml (0 ° C) 100 g / 100 mL (100 ° C)
Solubility: Insoluble in ammonia; alcohol separation

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General Information
Sodium bisulfate, whose chemical formula is NaHSO4, is an odorless, pearly white color which is called sodium hydrogen sulphate. It can be transported and stored safely when it is dry. The anhydrous form is hygroscopic. Sodium bisulfate gives acidic solution as hydrolysis in water. These acid solutions are corrosive and have corrosive effects on metals.

Production and Reactions

One of the production methods is based on the reaction of a mixture of stoichiometric amounts of sodium hydroxide and sulfuric acid. Consists of sodium bisulfate and water using two equivalent acids and one equivalent base.


Another production method is the reaction between sodium chloride (salt) and sulfuric acid. As a result of this high temperature reaction, sodium bisulfate and hydrogen chloride gas are formed.

NaCl H2SO4? NaHSO4 HCl

If sodium bisulfate is slowly heated, it loses its water to become sodium pyrosulfate.

2NaHSO4? Na2S2O7 H2O

If heating is carried out at high temperatures, sodium sulphate and sulfur trioxide are formed.

2NaHSO4? Na2SO4 SO3 H2O

Usage areas

Sodium bi sulfate is used in this sector as ph-lowering. Also, aromatic alcohols are used as the main ingredient in the production of sodium hydrosulfite with various organic substances such as aldehydes.

It is used to reduce the pH of water for active chlorination including swimming pools.

Sodium bisulfate is used as a feed additive in this sector, including pet feeds.

In making jewelery, sodium bi sulfate can be used to clean the oxidation layer formed after heating.


In textile industry, bleaching of fibers is used as stabilizer in dyeing and dyeing.

It can be used as antiseptic in many sectors and it can find different usage area as disinfectant in cosmetic sector and in many other fields as depilator in leather industry.

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