C-CO2-H2CO3-K2CO3-KHCO3

1)  [latex]C + O _{2} = CO _{2} [/latex] 2)  [latex]CO _{2} + H _{2} O = H _{2} CO _{3} [/latex] 3)  [latex]H _{2} CO _{3} + 2KOH = K _{2} CO _{3} + 2H _{2} O[/latex] 4)  [latex]H _{2} CO _{3} + K _{2} CO _{3} = 2KHCO _{3} [/latex] _______________________________________________________________