What is the principle behind alkali solutions absorbing sulfur dioxide?
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This post was last edited by liaifeng on 2018-8-1 10:45. What is the principle behind alkali solutions absorbing sulfur dioxide? 2NaOH + SO2 = Na2SO3 + H2O. Can everyone please confirm this?
What is Na2SO4? Can Na2SO4 be formed by the reaction of Na2SO3 with oxygen?
Na2SO3 also needs to be oxidized to form Na2SO4
Sodium sulfate (Na2SO4) is a salt formed by the combination of sulfate ions and sodium ions. It is soluble in water, and its aqueous solution is weakly alkaline; it dissolves in glycerin but not in ethanol. An inorganic compound; sodium sulfate decahydrate is also known as mirabilite. The high-purity, finely granulated anhydrous form is called Glauber’s salt. When exposed to air, it easily absorbs moisture to form sodium sulfate decahydrate, which is commonly referred to as mirabilite. Calcium sulfate, a white, odorless, bitter-crystalline or powdery substance that is hygroscopic. It appears as colorless, transparent large crystals or granular small crystals. It is mainly used in the manufacture of water glass, glass, ceramic glazes, pulp, refrigerant mixtures, detergents, desiccants, dye diluents, analytical chemicals, pharmaceuticals, feed, and more. At 241°C, sodium sulfate transforms into hexagonal crystals. In organic synthesis laboratories, sodium sulfate is one of the most commonly used drying agents for post-treatment.
Na2SO3 + H2SO4 == heating == Na2SO4 + H2O + SO2↑; H2SO4 is dilute sulfuric acid
Generating sodium sulfite is the correct approach
2NaOH + SO2 = Na2SO3 + H2O, that’s correct. It is not easy to continue oxidizing it to sodium sulfate.