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Sagot :
Answer:
Combination reaction
This reaction is a combination reaction because calcium oxide and water combine to create calcium hydroxide as the only result.
What is Ca(OH)2?
An inorganic substance called calcium hydroxide has several uses. It is also known as slaked lime, and limewater is the name of its aqueous solution.
Calcium hydroxide has the chemical formula Ca in both its composition and structure (OH)
2
and it has a 74.09 g/mol molar mass.
The calcium metal cation is linked to two hydroxide anions in this ionic molecule. Calcium hydroxide has a polymeric structure in its solid state, which is made possible by hydrogen bonds between the layers.
The mineral portlandite, a naturally occurring but seldom type of calcium hydroxide, is present in various volcanic and metamorphic rocks.
In order to make calcium hydroxide for use in industry, calcium oxide (lime or quicklime) is reacted with water.
CaO + H
2
O → Ca(OH)
2
On lesser scales, it may also be produced through the reaction of aqueous calcium chloride and sodium hydroxide.
Physical characteristics: It has a melting point of 580 °C and can be found as white powder or colorless crystals with a density of 2.21 g/cm3.
Chemical characteristics: Water may rather easily dissolve calcium hydroxide. It partly dissolves in water to create limewater, a moderately basic solution. Ca(OH)2 solution or limewater
salts when combined with acids, and it can corrode various metals, including aluminum. The process of carbonatation, which produces calcium carbonate from limewater and carbon dioxide, is advantageous:
Ca(OH)2+ CO2→ CaCO3+ H2O
Uses: Calcium hydroxide is used in a wide range of industrial processes, including the production of Kraft paper, water and sewage treatment, the production of ammonia, and pH adjustment. Additionally, it is a crucial component of mortars, cement, and plaster. It may be used in the food business for a variety of purposes, including pH correction, calcium fortification, digestion help, and baking soda replacement because it is a relatively non-toxic and gentle base.
Calcium hydroxide is not poisonous at low doses and poses no safety risks. However, inhaling, eating, or coming into touch with the aqueous calcium hydroxide solution at greater concentrations might result in lung damage, chemical burns, blindness, or serious skin irritation.
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