What is the reaction of sulfur dioxide and sodium hydroxide?
Sulfur dioxide (SO2) and sodium hydroxide (NaOH) react to form sodium sulfite (Na2SO3) and water (H2O) by the following reaction.
SO2 + 2NaOH = Na2SO3 + H2O
Other acidic oxides, such as carbon dioxide (CO2), react similarly with sodium hydroxide.
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See the sodium hydroxide article on en.wikipedia.org for further details.
If it is high school, need to have the following 4 properties: combustion of sulfur dioxide in oxygen; and concentrated sulfuric acid reaction of sulfur dioxide and water; and the reaction of hydrogen sulfide gas; and alkali at room temperature, the reaction of sulfide, sulfite and water, for example, and sodium hydroxide at room temperature, the reaction of sodium sulfide, sodium sulfite and water.
No amount of sodium sulphate can be formed from sodium hydroxide alone, because sodium sulfate contains sulfur and sodium hydroxide does not. By neutralization with sulphuric acid, one formula unit of sodium sulphate can be formed from two moles of sodium hydroxide, according to the equation 2 NaOH + H2SO4 -> Na2SO4 + 2 H2O.