The percentage of calcium in calcium carbonate is :

Key Points

Calcium carbonate:

• Calcium carbonate is a chemical compound with the formula CaCO₃.
• It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which is a type of sedimentary rock consisting mainly of calcite) and is the main component of eggshells, snail shells, seashells, and pearls.
• A limestone is a form of calcium carbonate.
• Other Different forms of calcium carbonate are Chalk and Marble.

Properties of Calcium Carbonate:

• Molar mass - 100.0869 g/mol.
• Odour - odourless.
• Appearance - Fine white powder; chalky taste.
• pH value - 9

Important Points

Molecular weight of CaCO_3​ = 40 + 12 + 3 × 16 = 100 gm

Mass of calcium in 1 mole of CaCO₃ ​= 40 gm

Percentage of calcium = (40/100) × 100 = 40%

Thus, the percentage of calcium in calcium carbonate is 40%