The formation of calcium carbonate on whitewashed walls creates a shiny finish by reflecting light uniformly. It fills imperfections, enhancing the walls’ appearance, contributing to their smooth and glossy look.
How does the formation of calcium carbonate contribute to the appearance of whitewashed walls?
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The formation of calcium carbonate contributes to the appearance of whitewashed walls through a process called carbonation. When slaked lime (calcium hydroxide) used in whitewashing reacts with carbon dioxide (CO2) present in the air, it forms calcium carbonate (CaCO3) and water. The calcium carbonate precipitates onto the surface, creating a thin layer of fine white crystals. This deposition of calcium carbonate gives whitewashed walls their characteristic white appearance, making them brighter and more visually appealing. Over time, as more carbonation occurs, the whitewash layer can become even more durable and resistant to weathering.
Whitewashing walls involves applying a mixture of slaked lime (Ca(OH)₂) and water to surfaces. When exposed to carbon dioxide (CO₂, present in the air), the slaked lime undergoes a reaction where carbon dioxide reacts with the calcium hydroxide to form calcium carbonate (CaCO₃). This newly formed calcium carbonate contributes to the appearance of whitewashed walls by creating a thin layer of a white, solid compound. The reaction not only provides a protective coating but also adds a bright and visually appealing finish, making whitewashing a common technique for both decorative and functional purposes in architecture.