Calcium carbonate (CaCO3) is generally insoluble in water due to the extremely strong electrostatic forces of attraction that exist in calcium carbonate molecules. However, under certain conditions, it can be partially soluble in pure water (15 mg/L at 25°C), and its solubility increases in rainwater saturated with carbon dioxide due to the formation of more soluble calcium bicarbonate.
CaCO3 is an insoluble solid in water. When carbonate combines with metals from the second group of the periodic table, the compounds are generally insoluble. Insoluble carbonates include magnesium carbonate, barium carbonate, and strontium carbonate.
Solubility is defined as a substance’s ability to form a solution when dissolved in another substance, or solvent.
Calcium carbonate (CaCO3)
Calcium carbonate is a chemical compound with the formula CaCO3. It is a carbonic salt of calcium that is also known as calcite or aragonite, the mineral ores of which it is composed.
It is commonly found in rocks and is the primary component of seashells, eggshells, snail shells, pearls, corals, and other materials. It is a white compound that is non-toxic and odourless. It is alkaline and reacts with acids to produce carbon dioxide.
When CaCO3 is added to water, the majority of the calcium carbonate molecules precipitate on the bottom, with only a small amount dissolved.
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