What Is Sodium Sulfite Anhydrous?

The inorganic compound sodium sulfite anhydrous (sodium sulfite) has the chemical formula Na2SO4. It's a white, water-soluble substance employed as an antioxidant and preservative in the food industry. Although a heptahydrate exists, it is less practical due to its increased sensitivity to oxidation by air.

Sodium Sulfite Anhydrous for sale at Camachem

Sodium Sulfite Anhydrous

Chemical and Physical Properties of Sodium Sulfite Anhydrous

Chemical formula


Molar mass

126.043 g/mol


White solid




2.633 g/cm3 (anhydrous)

1.561 g/cm3 (heptahydrate)

Melting point

33.4 °C (92.1 °F; 306.5 K)

(dehydration of heptahydrate)

500 °C (anhydrous)

Boiling point


Solubility in water   

27.0 g/100 mL water (20 °C)


Soluble in glycerol

Insoluble in ammonia, chlorine

Sodium Sulfite Anhydrous Uses

To keep dried fruit from discoloring, sodium sulfite is used as a preservative. In the chemical industry, it is used as a sulfonation and sulfomethylation agent. Its other uses are:

  • The pulp and paper sector is the primary user of sodium sulfite.
  • It is employed as a bleaching, desulfurizing, and dechlorinating agent in the textile sector as a reducing agent (e.g., in swimming pools).
  • Its reducing qualities are used as a preservative to avoid the discoloration of dried fruit and preserve meats.
  • Sulfonation and sulfomethylation agents employ it as a reagent.
  • It is what's utilized to make sodium thiosulfate.

Is Sodium Sulfite Anhydrous Safe?

Acute and prolonged exposure to the acidic breakdown of sodium sulfite anhydrous may generate poisonous and dangerous sulfur oxide gases, including sulfur dioxide, which may cause lasting respiratory problems. Industrially, sodium sulfite is created by reacting sulfur dioxide with a sodium carbonate solution.

How Is Sodium Sulfite Anhydrous Made?

Sulfite is made by treating a sodium hydroxide solution with sulfur dioxide. In warm water, Na2SO3 precipitates as a white solid. More SO2 dissolves the solid to form disulfite, which crystallizes on cooling.

Where To Buy Sodium Sulfite Anhydrous in Bulk?

Small amounts of Sodium Sulfite Anhydrous may be available in your region. When purchasing significant quantities of Sodium Sulfite Anhydrous, it is advisable to purchase directly from the makers. They may give certifications and cost reductions superior to purchasing the chemical in small amounts locally or via a distributor.

If you need large amounts of this chemical, you may purchase Sodium Sulfite Anhydrous in bulk on our website or contact us for further details.

Which Countries Manufacture Sodium Sulfite Anhydrous in Bulk?

The consumption of Sodium Sulfite Anhydrous has increased dramatically across the world, especially in developing countries. Therefore, its huge demand has led to a surge in companies that produce it. The main producers of Sodium Sulfite Anhydrous are:

  • China
  • United Kingdom
  • United States of America
  • Australia
  • Taiwan
  • India

How Is Sodium Sulfite Anhydrous Exported?

Sodium Sulfite Anhydrous is shipped in:

  • Plastic woven bag 50kg/bag capacity
  • It is possible for arrangement for an appropriate package term based on the amount of the buyer's order or other particular requirements.

Sodium Sulfite Anhydrous for sale at Camachem

Packaging of Sodium Sulfite Anhydrous

What Is the Latest Sodium Sulfite Anhydrous Price?

Because Sodium Sulfite Anhydrous is a commodity, its price fluctuates based on the cost of raw ingredients, transportation, and other industrial inputs like labor and taxes. Please contact us for the most up-to-date Sodium Sulfite Anhydrous prices, and we will send you a quote that includes delivery to your country.

Sodium Sulfite Anhydrous for sale at Camachem

Sodium Sulfite Anhydrous Cost

Where To Buy Sodium Sulfite Anhydrous?

Here at Camachem, we have Sodium Sulfite Anhydrous for sale. We export worldwide, so you can contact us for a FREE quotation via the email address [email protected] or send a message on WhatsApp for a fast response at +86-131-2037-9271.