When calcium is added to water, it reacts with the water molecules to form calcium hydroxide and hydrogen gas. This reaction is exothermic, meaning it releases heat. The hydrogen gas produced can be observed as bubbles forming on the surface of the calcium metal. Calcium hydroxide is a white solid that is slightly soluble in water, and it is a weak base.
Here are some examples of how calcium is added to water:
- In swimming pools: Calcium chloride is added to increase the calcium hardness of the water, which helps to prevent corrosion and scaling of pool equipment.
- In aquariums: Calcium is added to provide a source of calcium for snails and other invertebrates that need it to build their shells.
- In water treatment: Calcium hypochlorite is used as a disinfectant in water treatment plants.
- For tire ballast: A mixture of calcium and water is used to add weight to tractor tires for added traction.
