The scheme of transformations SO2-H2SO3-K2SO3-CaSO3 is given. Write down the molecular equations

The scheme of transformations SO2-H2SO3-K2SO3-CaSO3 is given. Write down the molecular equations of the reactions with the help of which the indicated transformations can be carried out. For the second transformation, compose the ionic transformation.

Consider the chain of transformations presented in the task. To implement it, we need to carry out three reactions. The first is the chemical interaction of sulfur and oxygen. As a result of this reaction, we obtain tetravalent sulfur oxide. This reaction proceeds as a compound.

S + O2 = SO2
Next, tetravalent sulfur oxide and water interact. As a result of the compound reaction, we get sulfurous acid.

SO2 + H2O = H2SO3
Next, we carry out an exchange reaction between sulfurous acid and potassium hydroxide. This is a neutralization reaction, as a result of which we get a potassium sulfide salt and water. The molecular equation of the reaction can be written as follows:

H2SO3 + 2 KOH = K2SO3 + 2 H2O
The ionic reaction equation can be written as follows:

2 H ⁺ + SO₃ ^2- + 2 K ⁺  + 2 OH ^– = 2 K ⁺ + SО₃ ^– + 2 H₂O

An abbreviated ionic equation can be written as follows:

2 H + + 2 OH – = 2 H2O.