Chemical Change: Formation of a Precipitate
When two solutions are combined, they may form a solid substance.
This solid substance is called a precipitate and indicates that a chemical change has occurred.
When carbon dioxide is combined with aqueous calcium hydroxide
(limewater), solid calcium carbonate (chalk) is formed as the precipitate. The
precipitate may be in the form of very small particles, appearing as cloudiness in the
solution or as a solid which settles to the bottom of the container.
Chemical Equation:
Ca(OH)2 + CO2 → CaCO3+ H2O
(Limewater + Carbon dioxide → Calcium carbonate + water)
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