NaHCO3 + NaOH = Na2CO3 + H2O
CO2 + NaOH = NaHCO3, CO2 + 2NaOH = Na2CO3 + H2O
ZnOHOHOH2 + 2NaOH = Na2Zn(OH)4Zn(OH)4Zn(OH)4
NaHCO3 + NaOH = Na2CO3 + H2O
CO2 + NaOH = NaHCO3, CO2 + 2NaOH = Na2CO3 + H2O
ZnOHOHOH2 + 2NaOH = Na2Zn(OH)4Zn(OH)4Zn(OH)4