What is a Calcium carbonate (CaCO₃) ?

Calcium carbonate (CaCO₃) is a white, odorless powder that occurs abundantly in nature as limestone, marble, and chalk, and is a chemically stable, slightly basic inorganic compound widely used across various industries including construction materials (cement, stone), paper, plastics, rubber, paints, toothpaste, and food additives (as a calcium supplement or preservative); it also reacts with acids to release carbon dioxide, making it useful as an antacid for treating excess stomach acid, and it is commonly used in educational settings for demonstrating acid-base reactions and CO₂ generation experiments, though inhalation of its dust may irritate the respiratory system, requiring protective masks and proper ventilation during handling; nonetheless, it is considered environmentally safe, biodegradable, and low in toxicity.

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