What is the reaction equation for calcium hydroxide and sulfur dioxide, and how do you know what to combine with what

SO2+Ca (OH)2=CaSO3 H2O
Kind of like a double decomposition reaction.

SO2+Ca (OH)2=CaSO3 H2O
Kind of like a metathesis.

Urgent: Equation for the reaction of sulfur dioxide and calcium hydroxide solution

Small amount of SO2+Ca (OH)2=CaSO3(precipitation)+H2O
Excess 2SO2+Ca (OH)2= Ca (HSO3)2
Excess is the formation of a small amount of annoying CaSO3(precipitation) to continue the reaction with SO2 to form Ca (HSO3)2
I.e. CaSO3+SO2+H2O=Ca (HSO3)2

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