Question

How does carbon dioxide react with the following? 

1. Potassium 

2. Lime water 

3. Sodium hydroxide

Answer 1

1. Potassium combine with CO₂ to form potassium carbonate. 

4K + 3CO → 2K₂CO₃ + C

2. When a limited amount of CO₂ is passed through lime water, it turns milky due to the formation of insoluble calcium carbonate. 

Ca(OH)₂ + CO₂ → CaCO₃ + H₂O 

(Calcium carbonate) 

3. Sodium hydroxide (base) is neutralized by carbon dioxide (acidic) to form sodium carbonate (salt) and water.

Base + Acid ⟶ Salt + Water