Here's the balanced chemical equation:
Ca(OH)₂ (aq) + 2 HNO₂ (aq) → Ca(NO₂)₂ (aq) + 2 H₂O (l)
Explanation:
* Calcium hydroxide (Ca(OH)₂) is a strong base. It dissociates completely in water, releasing hydroxide ions (OH⁻).
* Nitrous acid (HNO₂) is a weak acid. It partially dissociates in water, releasing hydrogen ions (H⁺).
* Neutralization reaction: The hydroxide ions from the base react with the hydrogen ions from the acid to form water (H₂O).
* Calcium nitrite (Ca(NO₂)₂) is a soluble salt. It dissolves in water and remains in solution.
Important Notes:
* The reaction is exothermic, meaning it releases heat.
* The reaction is typically carried out in aqueous solution.
* Nitrous acid is unstable and decomposes easily, so it's important to use fresh solutions.
This reaction is a classic example of acid-base chemistry and demonstrates the fundamental principles of neutralization reactions.
