It may be prepared by reacting lime with an excess of sulfurous acid , essentially a mixture of sulfur dioxide and water .
Calcium bisulfite ( calcium bisulphite ) is an inorganic compound which is the salt of a calcium cation and a bisulfite anion .
Calcium bisulfite may be prepared by reacting lime with an excess of sulfurous acid , essentially a mixture of sulfur dioxide and water .
Calcium bisulfite ( calcium bisulphite ) is an inorganic compound which is the salt of a calcium cation and a bisulfite anion .