What Is Sodium Bisulphate?

Natural salt deposit.

Sodium bisulphate is a chemical compound, formula NaHSO4, classed as an acid salt. The prefix "bi" denotes partial neutralization of the parent acid---one hydrogen atom per molecule remains and is incorporated in the crystalline structure of the salt.

Properties

Sodium bisulphate is naturally occurring, colorless and granular in form. It is hygroscopic (absorbs atmospheric moisture) and melts at 136 degrees Fahrenheit. Solubility is 67 gm per 100 gm water and its equilibrium PH is 1.4.

It is produced in large quantities through neutralization of sulfuric acid by sodium hydroxide (a base), and also by reaction of sodium chloride (ordinary salt) and sulfuric acid.

Uses

The acidic and anti-bacterial properties of sodium bisulphate have been exploited in industrial, agricultural and food applications. It is used principally as an acidifier. Major applications include cleaning and metal finishing products, feed and pet food additives.

Food grade sodium bisulphate is used in a variety of foods including beverages, dressings, sauces and fillings and it is used in meat and poultry processing.

Dangers

In pure form sodium bisulphate is a corrosive irritant. It burns skin and eyes, and may be harmful or fatal if ingested. It is stable in storage, but exposure in air leads to noxious decomposition products such as sulfur dioxide. It should be handled with care.

References

• SODIUM BISULFATE material safety data sheet
• Sodium Bisulphate and Sodium Bisulphite
• Use of Sodium Bisulfate to Reduce Ammonia Emissions from Poultry and Livestock Housing

Resources

• Sodium Bisulphate and Sodium Bisulphite