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Sodium sulfate is an inorganic compound with the formula Na2SO4. It is a white, crystalline powder that is soluble in water and most other organic solvents. Sodium sulfite, on the other hand, is a soluble salt of sodium and sulfur. It has the formula Na2SO3. Both substances are used to make sulfurous acid, which is a colorless liquid with a pungent odor.
What is sodium sulfate?
Sodium sulfate (Na2SO4) is a white, crystalline powder that is used as an agricultural chemical and in the making of paper, textiles, and other chemicals. It is also used as a food preservative and in the manufacture of glass.
The mineral thenardite is also referred to as anhydrous sulfate, and the decahydrate Na2SO4.10H2O is also referred to as Glauber's salt or mirabilis. When Na2SO4.7H2O is cooled, it changes into a mirabilite. The decahydrate exists naturally as the mineral mirabilite. Mirabilite supplies around two-thirds of the world's sodium sulfate production. Additionally, it is made from the leftovers of chemical changes like the creation of hydrochloric acid. Sodium sulfate is found in most grocery stores. Anhydrous sodium sulfite (NaHSO4) is a more concentrated form of the compound and is used as a food additive to prevent spoilage.
When these two compounds are mixed, they react to form sulfur dioxide gas and water. The reaction occurs quickly at room temperature and produces a bright orange vapor. There are other chemical compunds here like Rongalite Lump/powder, Zinc Oxide and Sodium Hydroxide

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What is anhydrous sodium sulfite?
Anhydrous Sodium Sulfite is a chemical compound that consists of an atom of sodium and an atom of sulfur. This compound is used in the production of many different chemicals, such as bleach and detergents. Sodium sulfite is also used to make sulfate salts, which are important in the agricultural industry. A white, water-soluble, crystalline substance with a sulfurous, salty flavor is sodium sulfite (Na2SO3). When heated, it disintegrates. It often comes in pill, crystal, and powdered. Another dechlorinating agent that utilities frequently utilize is sodium sulfite. Natural sodium sulfite has a mildly alkaline pH. A reducing substance called sodium sulfite is said to scavenge more oxygen than sodium thiosulfate. Sodium sulfite was utilized by the culinary industry to help keep food goods fresh appearances. It is a component in many medications that aid in maintaining their stability and potency. The FDA has approved sodium sulfite as a brand-new, minimally important animal medication.
How will they react together?
The reaction between sodium sulfate and anhydrous sodium sulfite will produce hydrogen gas and sodium sulfide. The hydrogen gas will cause the reaction to occur quickly, and the color of the solution will change from a light yellow to a dark brown. The solution will also become thick and viscous.

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Conclusion
In general, sodium sulfate and Zinc Oxide will react with each other to form a white precipitate. The reaction is exothermic and the temperature of the reaction will increase until the two salts are completely reacted.