Continuous introduction of SO2 into clarified lime water SO2 continuous introduction of clarified lime water

First it becomes turbid because of the formation of calcium sulfite (insoluble), then it continues to react to form calcium bisulfite (soluble) due to too much calcium sulfite and becomes clear.
Ca (OH)2+SO2=CaSO3 precipitation+H2O
Ca (OH)2+SO2=Ca (HSO3)2

First turbidity, because the formation of calcium sulfite (insoluble), and then too much calcium sulfite, and then continue to react to form calcium bisulfite (soluble), and become clear.
Ca (OH)2+SO2=CaSO3 precipitation+H2O
Ca (OH)2+SO2=Ca (HSO3)2

NaOH,HCI,CaCO3,Ca (OH)2,HNO3,AgCI, belong to acid? What is the alkali?

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