One of the stages of water treatment for supply consists of adding lime or soda ash (sodium carbonate) to adjust the pH. The molecular formula of l...

One of the stages of water treatment for supply consists of adding lime or soda ash (sodium carbonate) to adjust the pH. The molecular formula of lime and soda ash are, respectively:

Lime, also called quicklime, burnt lime, or calcium oxide, is the substance with the chemical formula CaO.
Sodium carbonate, Na₂CO₃, is a white and translucent salt. Its major applications are: production of glass, paper, rayon, soaps, and detergents. It is synthetically produced on a large scale from table salt by the Solvay process or extracted from trona ores.
CaO and Na2CO3
CaO and NaBO
Ca(OH)2 and NaCO2
CaO and NaBO
KO and K2CO3