Write the reaction equation: C- CO2- H2CO3- K2CO3

1) Carbon burns in sufficient oxygen under normal conditions to form carbon dioxide.

C + O2 = CO2

But with a lack of oxygen, carbon monoxide is formed, CO, which can also be burned into oxygen to form carbon dioxide.

2 С + O2 = 2 CO

2 CO + O2 = 2 CO2

2) Carbon dioxide is passed through the water. The result is a weak acid – carbonic acid. Carbonic acid at normal conditions unstable and quickly decomposes into water and carbon dioxide.

CO2 + H2O = H2CO3

3) Carbonic acid, like other acids, enters into a neutralization reaction with bases. When interacting with potassium hydroxide, a potassium carbonate salt and water are formed. Potassium carbonate, in contrast to carbonic acid, is a stable salt and can only be thermally decomposed with strong heating (about 1200 degrees).

H2CO3 + 2 KOH = K2CO3 + H2O