Oxyacid refers to the salt containing oxygen element. The chemical equation is Na2O+Co2=Na2Co3.
The acid containing oxygen element in the acid is an oxyacid, and the salt produced by its reaction with alkali is an oxyacid salt.
Reaction Introduction
Na2O+Co2=Na2Co3
CaO+Co2=CaCo3
Most basic and acid oxides can carry out this reaction. The stronger the alkali alkalinity corresponding to the alkaline oxide and the stronger the acidity corresponding to the acidic oxide, the easier the reaction will be. For example:
K2O (corresponding to KOH, strong base)+So3 (corresponding to H2SO4, strong acid)=K2SO4
All salts containing oxygen are oxyacid salts, such as sodium sulfate, barium sulfate, sodium bicarbonate wait 
