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Anonymous users2024-02-07What is Limestone].
The main component of limestone is calcium carbonate. Calcium carbonate is produced by the combination of calcium ions and carbonate ions, so it is both a calcium salt and a carbonate.
Calcium carbonate (CaCO3) is a white solid that is poorly soluble in water. Lime and limestone are raw materials that are widely used in building materials and industry. In nature, the main components of marble, limestone, calcite, white sitting, eggshells, pearls and other substances are calcium carbonate; The main ingredient in many calcium supplements, such as calcium tablets, is also calcium carbonate.
Experiments on the preparation of limestone].
1) Calcium carbonate related chemical formulas:
CaCO3 2HCl==CaCl2+H2O+CO2 (the principle of CO2 produced in the laboratory).
CaCO3CAO+CO2 (industrially made CO2).
2) Test method for calcium carbonate:
Method: A small amount of calcium carbonate was put into a test tube, dilute hydrochloric acid was added, and the colorless gas produced was passed into the clear lime water.
Phenomenon: A large number of bubbles are generated, and the clarified lime water becomes turbid.
Chemical equation: CaCO3 2HCl==CaCl2+H2O+CO2, CO2+Ca(OH)2==CaCO3 +H2O
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Anonymous users2024-02-06Strictly speaking. Quicklime belongs to the mixture.
There is no chemical formula.
Its main components are:
Calcium oxide. Chemical formula.
CAO hopes it helps.
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Anonymous users2024-02-05The chemical formula of quicklime is cao, which is a white solid that reacts with water to form calcium hydroxide.
And emit a lot of heat, calcium hydroxide is commonly known as hydrated lime.
or slaked lime. Usually, the main ingredient is calcium carbonate.
The natural rock can be decomposed to form carbon dioxide when calcined at high temperatures.
and calcium oxide. All natural rocks with calcium carbonate as the main component, such as limestone, chalk, dolomitic limestone, etc., can be used to produce lime.
Properties and uses: white (or gray, brown-white), amorphous, absorbs water and carbon dioxide in the air. Calcium oxide reacts with water to form calcium hydroxide and releases heat.
Soluble in highly buried acid water, insoluble in alcohol. It is an inorganic alkaline corrosive article, and the national hazard code is 95006.
Quicklime is mainly used in steel, pesticides, pharmaceuticals, and desiccant.
tanning and alcohol dehydration, etc. Quicklime generally contains over-fired lime, which matures slowly, and if it is cured after the lime slurry is hardened, it will cause uplift and cracking due to the expansion produced by curing. In order to eliminate this hazard of over-fired lime, the lime should be "aged" for about 2 weeks after it is cured.
Scope of application: It is especially suitable for puffed food, mushrooms, fungus and other local products, as well as products in instrumentation, medicine, clothing, electronic telecommunications, leather, textiles and other industries.
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Anonymous users2024-02-04The chemical formula of quicklime is CAOIt is a white solid, which reacts with water to form calcium hydroxide and releases a large amount of heat, the common name of calcium hydroxide is hydrated lime or slaked lime, cao+h2o ca(oh)2, slaked lime or slaked lime.
Lime is an air-hard inorganic cementitious material with calcium oxide as the main component. Lime is a product with high calcium carbonate content such as limestone, dolomite, chalk, shell, etc., which is calcined by 900 1100.
Maturation and hardening.
The process by which quicklime (CAO) reacts with water to form calcium hydroxide is called the maturation or digestion of lime. The product produced by the reaction, calcium hydroxide, is called hydrated lime or slaked lime.
When the lime is cured, a large amount of heat is released, and the volume is doubled. The lime with good calcination and high calcium oxide content matures faster, and the heat release and volume increase more. There are two commonly used methods of slaked lime on the construction site: slaked lime slurry method and slaked lime powder method.
Depending on the amount of water added, lime can be matured into slaked lime powder or lime paste. The theoretical water requirement for lime curing is 32% of the lime weight. In quicklime, 60% 80% water is evenly added to obtain slaked lime powder with fine particles and uniform dispersion.
If it is cured with excessive water, it will obtain lime paste with a certain consistency.
Lime generally contains flint lime, flint lime cures slowly, and if it is cured after the lime slurry hardens, it will cause uplift and cracking due to the expansion produced by curing. In order to eliminate this hazard of over-fired lime, the lime should be "aged" for about 2 weeks after it is cured.
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Anonymous users2024-02-03The chemical formula of quicklime is CAOQuicklime, also known as burnt lime, is mainly composed of calcium oxide (CAO), which is usually prepared by calcining natural rocks whose main component is calcium carbonate at high temperatures to decompose carbon dioxide and calcium oxide.
Uses:
Quicklime is a commonly used desiccant to remove water vapor by chemical absorption, and is also used for steel, pesticides, medicines, desiccant, tanning and alcohol dehydration.
It is especially suitable for puffed food, shiitake mushrooms, fungus and other local products, as well as products in instrumentation, medicine, clothing, electronic telecommunications, leather, textile and other industries.
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Anonymous users2024-02-02The chemical formula of quicklime is CAOThe physical properties are white powder on the surface, gray-white for impurities, light yellow or gray when containing impurities, and hygroscopic.
Calcium oxide is a basic oxide that is sensitive to moisture. It easily absorbs carbon dioxide and moisture from the air. It reacts with water to form calcium hydroxide and produces a lot of heat, which is corrosive.
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Anonymous users2024-02-01The chemical formulas of quicklime and hydrated lime are: cao, caco. The chemical formula of quicklime is cao calcium oxide, the chemical formula of slaked lime is ca(oh)2 calcium hydroxide, quicklime to slaked lime:
CaO+H2O=Ca(OH)2, which is a chemical reaction that will release a lot of heat.
The process by which quicklime (CAO) reacts with water to form calcium hydroxide, called maturation or digestion of lime, reacts with water (while releasing a large amount of heat), or absorbs moisture from moist air, i.e., mature lime.
Hydrated lime is a white powdery solid, strong alkaline, with sterilization and antiseptic ability, and has a corrosive effect on ** and fabrics. Calcium hydroxide has a wide range of applications in industry. It is commonly used as a building material, and is also used as a fungicide and chemical raw material, etc.
Solution: The equation for the conversion of quicklime (CAO), hydrated lime (CA(OH)) and limestone (CACO) is as follows. >>>More
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