கொஞ்சம் கெமிஸ்ட்ரி ! - EP.012

 

Chemical Composition and Properties:

• Formula: CaCO₃

• Molecular Weight: 100.09 g/mol

• Appearance: White, odorless powder or colorless crystals

Natural Occurrence:

• Minerals: Found in minerals like calcite, aragonite, and vaterite

• Sedimentary Rocks: Main component of limestone and marble

• Biological Role: Present in the shells of marine organisms, snails, pearls, and eggshells

Industrial Uses:

• Construction: Used as a building material (marble), aggregate (limestone), and in cement production

• Food Industry: Acts as a calcium supplement, acidity regulator, and an anti-caking agent

• Pharmaceuticals: Used in antacids and as a calcium source

• Paper Production: Acts as a filler and coating pigment

• Plastics: Increases the durability and extends the life of plastic products

• Paints: Serves as a white pigment (also known as whiting)

Reactions:

• With Acids: Reacts with acids to produce carbon dioxide, water, and a dissolved salt, e.g., CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

• Thermal Decomposition: Decomposes to form calcium oxide (quicklime) and carbon dioxide upon heating, e.g., CaCO₃ → CaO + CO₂

Environmental Impact:

• Natural Waterways: Helps neutralize acidic waters and acts as a natural buffering agent

• Acid Rain: Limestone can be used to neutralize the effects of acid rain on lakes and soils

• Carbon Sequestration: Calcium carbonate formation helps in capturing carbon dioxide from the atmosphere

Health and Safety:

• Inhalation: Dust can irritate the respiratory tract

• Ingestion: Generally considered safe, but excessive intake can lead to hypercalcemia (high levels of calcium in the blood)

• Skin Contact: May cause minor irritation