The use of traditional energy sources are prone to produce highly polluting gases sulfur dioxide, please answer the question of the laboratory to study the nature of sulfur dioxide: (1) choose the app

The use of traditional energy sources are prone to produce highly polluting gases sulfur dioxide, please answer the question of the laboratory to study the nature of sulfur dioxide: (1) choose the appropriate in the actual (1) sulfur dioxide is soluble in water, laboratory preparation of sulfur dioxide should be more concentrated sulfuric acid and soluble sulfite preparation, CaSO3 solid in the question is easy to react with sulfuric acid to generate slightly soluble calcium sulfate, but the reaction is difficult to carry out,

The answer is: ② ③;

(2) the reaction does not need to be heated, the available solids and liquids can be used to prepare gases of the reaction device, only AD B does not form a closed container, easy to lead to the escape of sulfur dioxide,

So the answer is: AD;

(3) sulfur dioxide is an acidic gas, can be used to alkaline absorption of exhaust gas, such as sodium hydroxide solution, the ionic equation of the reaction is SO2 + 2OH- ═SO32- + H2O,

So the answer is: NaOH solution or other reasonable solution such as KOH, ammonia, etc.; SO2+2OH-═SO32-+H2O.