Water of crystallization is the fixed number of water molecules present in one formula unit of a salt. It affects the physical properties and appearance of salts, such as causing color changes in copper sulfate crystals.
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Sodium carbonate can be used as a cleaning agent for domestic purposes, such as removing stains or grease from various surfaces.
Washing soda can be obtained by heating baking soda (sodium hydrogen carbonate), followed by recrystallization of sodium carbonate.
Sodium hydrogencarbonate, being alkaline, neutralizes excess acid in the stomach, providing relief from symptoms of acidity.
Sodium hydrogencarbonate is used in soda-acid fire extinguishers to generate carbon dioxide gas, which helps extinguish fires by displacing oxygen.