1. Sodium Hydroxide and Calcium Carbonate
Sodium hydroxide (NaOH) is a strong base, and calcium carbonate (CaCO₃) is a weak base. When they react, they undergo a double displacement reaction, forming sodium carbonate (Na₂CO₃) and calcium hydroxide (Ca(OH)₂):
2NaOH (aq) + CaCO₃ (s) → Na₂CO₃ (aq) + Ca(OH)₂ (s)
Calcium hydroxide is sparingly soluble in water, so it precipitates out as a solid.
2. Sodium Carbonate and Calcium Carbonate
Sodium carbonate (Na₂CO₃) and calcium carbonate (CaCO₃) don't react directly with each other under normal conditions. This is because both are salts and generally don't participate in significant reactions when mixed together.
Overall Reaction
The overall reaction can be summarized as:
2NaOH (aq) + CaCO₃ (s) → Na₂CO₃ (aq) + Ca(OH)₂ (s)
Important Notes
* Equilibrium: The reaction between NaOH and CaCO₃ is an equilibrium reaction. While it favors the formation of Na₂CO₃ and Ca(OH)₂, some unreacted NaOH and CaCO₃ will remain in solution.
* Conditions: The reaction is usually conducted at room temperature and pressure.
* Applications: This reaction is relevant in the production of lime (CaO) from limestone (CaCO₃) using the Solvay process.
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