<Dl> <Dd> Ca (OH) (aq) + SO (g) → CaSO (s) + H O (l) </Dd> </Dl> <Dd> Ca (OH) (aq) + SO (g) → CaSO (s) + H O (l) </Dd> <P> Limewater is used in a process known as lime softening to reduce water hardness . It is also used as a neutralizing agent in municipal waste water treatment . </P> <P> In buon fresco painting, limewater is used as the colour solvent to apply on fresh plaster . Historically, it is known as the paint whitewash . </P>

What compound is formed when carbon dioxide reacts with water