_Co2+_NaOH====_Na2Co3+__H2O

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___Co2+___NaOH====___Na2Co3+____H2O___Co2+___NaOH====___Na2Co3+____H2O___Co2+___NaOH====___Na2Co3+__

___Co2+___NaOH====___Na2Co3+____H2O
___Co2+___NaOH====___Na2Co3+____H2O

___Co2+___NaOH====___Na2Co3+____H2O
_1__Co2+___2NaOH====__1_Na2Co3+__1__H2O

1+2=1+1

1 2 1 1

CO2+2NaOH=Na2CO3+H2O