Regarding how to purify concentrated sulfuric acid as much as possible, experts who know the answer, please step in
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For example, a certain volume of solution. . . Seventy percent of it is sulfuric acid. Thirty percent is sulfurous acid. . If we just heat the solution. . . While heating. . . . Insert a tube into the solution. . . Air is blown into the solution through this tube. . . . Air forms bubbles in the solution. . . Bubbles carry the SO2 out of it. Using this simple method, to what extent can sulfuric acid be purified? Or in other words, how much of the SO2 can be removed from it?
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This needs to be determined based on the requirements for the sulfur dioxide content in the final product