Write the reaction equations: KOH → KHCO3 → K2CO3 → KNO3 → KNO2

Let’s compose the reaction equations:
2KOH + CO2 = K2CO3 + H2O – ion exchange reaction;
K2CO3 + CO2 + H2O = 2KHCO3 – ion exchange, potassium bicarbonate is formed;
KHCO3 + KOH (conc.) = K2CO3 + H2O – ion exchange, potassium carbonate was obtained;
K2CO3 + 2HNO3 = 2KNO3 + CO2 + H2O – ion exchange, potassium nitrate is obtained;
KNO3 = KNO2 + O2 – decomposition occurs when heated to 400 degrees, potassium nitrite is obtained.
Potassium nitrate finds practical application as a valuable fertilizer containing trace elements potassium and nitrogen. The reaction equations confirm the connection between bases and salts.