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Slaked Lime Formula and Chemical Name, Uses

Slaked Lime

Slaked lime, often known as calcium hydroxide, is an inorganic substance having the chemical formula Ca(OH)2. When water is combined with quicklime (calcium oxide), a colourless crystal or white powder is created. It goes by a variety of names, including pickled lime, hydrated lime, caustic lime, builders’ lime, and slaked lime. Calcium hydroxide, often known as E number E526, is a chemical that is employed in a variety of processes, including the production of food. A saturated solution of calcium hydroxide is known as limewater, often known as milk of lime.

Slaked Lime Formula

The Slaked Lime Formula is Ca(OH)₂.

Slaked lime is the traditional name for calcium hydroxide. Slaked lime is a colourless crystal or white powder made up of an inorganic compound with the chemical formula Ca(OH)2. Quicklime, or calcium oxide, is combined or slaked with water to generate it. Food preparation is one of the many applications for calcium hydroxide. Limewater is sometimes known as lime milk. It’s the usual name for a calcium hydroxide saturated solution.

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Slaked Lime Formula

Slaked lime which is Calcium Hydroxide has 1 atom of Ca and 2 hydroxide ions, which is indeed two atoms each of Oxygen and Hydrogen, and hence the Chemical Formula of Slaked lime is Ca(OH)2.

Sodium Hydroxide, Chemical Formula, Uses, Common Name

Slaked Lime Formula and Chemical Name

Water reacts with calcium oxide to produce calcium hydroxide (Ca(OH)2). When lime is mixed with water, only a little percentage of it dissolves, generating limewater, while the rest remains as a suspension known as milk of lime. Calcium hydroxide is a common industrial alkali that is also found in mortars, plasters, and cement. It’s utilised in the kraft paper process and as a sewage treatment flocculant. It can be made in the lab by combining aqueous calcium chloride and sodium hydroxide solutions. Portlandite, a mineral form, is uncommon but can be found in volcanic, plutonic, and metamorphic rocks. It’s also been reported to appear in coal-fired power plants.

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Dry Slaked Lime Formula

Calcium hydroxide has the chemical formula Ca(OH)2. It’s a type of ionic compound. Calcium loses two electrons to polyatomic hydroxide ions in this reaction. Ca+2 ions create one ionic connection with each OH- ion in slaked lime. Although the oxygen and hydrogen atoms in the polyatomic hydroxide anion have covalent connections. Between the layers of calcium hydroxides, strong hydrogen bonds exist. It has a hexagonal crystal structure as a result of this.

Slaked Lime Formula and Uses

  • Lime mortar is frequently made with calcium hydroxide.
  • The use of calcium hydroxide as a flocculant is one of its most common uses. It is utilised in the treatment of water and sewage. It’s also utilised in the treatment of freshwater to raise the pH so that pipes don’t corrode.
  • The paper sector is another important use. Green liquor is a solution primarily of sodium carbonate and sodium sulphate created by dissolving smelt, which is the molten form of these chemicals from the recovery furnace, in the causticizing operation.
  • Slaked lime is commonly utilised in the food business because of its low toxicity and mild basic characteristics.
  • Calcium hydroxide is commonly chewed alongside coca leaves to preserve the alkaloid stimulants chemically accessible for body absorption.
  • To preserve the alkaloid stimulants chemically available to reach the bloodstream via sublingual absorption, calcium hydroxide is frequently added to a bundle of areca nut and betel leaf called “paan.”
  • Usually, calcium hydroxide is used to make lime mortar.
  • The use of calcium hydroxide as a flocculant in water and sewage treatment is a prominent application.
  • It produces a cleaner end product by helping to remove tiny particles from water by forming a fluffy charged solid.
  • The affordability and low toxicity of calcium hydroxide make its use possible.
  • Because it is self-regulating and doesn’t elevate the pH too high, it is also used in fresh water treatment to improve the pH of the water so that pipes won’t corrode when the base water is acidic.
  • It has a significant use in the paper industry as an intermediate in the reaction that yields sodium hydroxide.
  • The Kraft pulp-making process includes a causticizing stage that includes this conversion.
  • Sodium carbonate and sodium sulphate are dissolved in green liquor, which is created by dissolving smelt, which is the molten form of these chemicals from the recovery furnace, in the causticizing process.
  • Calcium hydroxide is employed as a fungicide in orchard crops.
  • The application of “lime water” stops the growth of cankers brought on by the fungus Neonectria galligena.
  • To avoid toxic burns caused by the extremely reactive calcium hydroxide, the trees are sprayed during the winter months while they are dormant. Regulations governing basic substances permit its use in the European Union and the United Kingdom.
  • The use of calcium hydroxide in dentistry is mostly restricted to the field of endodontics.

Slaked Lime Water Formula: Properties

  • Calcium hydroxide is not very water-soluble.
  • An alkaline solution with a pH of around 12.5 results from the calcium hydroxide (portlandite) dissolving in clean water at room temperature.
  • Chemical burns can be brought on by calcium hydroxide solutions.
  • Due to a common-ion reaction with the hydroxide anion OH, its solubility dramatically reduces at high pH levels. The behaviour described here applies to cement pastes.
  • Limewater is the name for aqueous solutions of calcium hydroxide, which react with acids to form medium-strength bases that can attack some metals like aluminium while shielding other metals like iron and steel from corrosion by passivating their surfaces.

The process of carbonatation, which results in the creation of insoluble calcium carbonate and causes limewater to turn milky in the presence of carbon dioxide:

Ca(OH)2 + CO2 → CaCO3 + H2O

Calcium hydroxide has a low water solubility and a retrograde solubility. It has a large enough dissociation in water that its solutions are basic, according to the dissolution reaction:
Ca(OH)2 → Ca2+ + 2 OH−
Calcium hydroxide dissolves in pure water at room temperature to form an alkaline solution with a pH of about 12.5. Chemical burns can be caused by calcium hydroxide solutions. Its solubility drops dramatically at high pH levels. Limewater is a medium-strength base made up of aqueous calcium hydroxide solutions. Other metals, such as iron and steel, are protected from corrosion via passivation of their surfaces. In the presence of carbon dioxide, limewater turns milky due to the creation of calcium carbonate, a process known as carbonation:
Ca(OH)2 + CO2 → CaCO3 + H2O
When calcium hydroxide is heated to 512 °C, the partial pressure of water in equilibrium with it reaches 101 kPa (normal atmospheric pressure), causing calcium hydroxide to disintegrate into calcium oxide and water:
Ca(OH)2 → CaO + H2O

It can be made in the lab by combining aqueous solutions of sodium hydroxide with calcium chloride. Although portlandite is a very uncommon mineral type, some volcanic, plutonic, and metamorphic rocks contain it. It has also been reported to appear in coal heaps that are burning. S-type stars have been shown to have the positively charged ionized species CaOH+ in their atmospheres.

Slaked Lime Formula- FAQs

What is the difference between slaked lime and quick lime?

Quicklime and hydrated lime vary in that quicklime contains calcium oxide and hydrated lime contains calcium hydroxide.

What is the lime formula?

CaO is the chemical formula for lime or quicklime.

How does limestone become slaked lime?

The lime cycle is the process of converting limestone (calcium carbonate) to quicklime by heating, then slaked lime by hydration, and finally to calcium carbonate through carbonation.

How is Soda-lime made?

Slaked lime is treated with a strong sodium hydroxide solution to make it.

Is slaked lime a basic or an acid?

When calcium hydroxide, commonly known as slaked lime, is dissolved in aqueous solutions, it produces hydroxide ions. As a result, this substance is a base.

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FAQs

What is the difference between slaked lime and quick lime?

Quicklime and hydrated lime vary in that quicklime contains calcium oxide and hydrated lime contains calcium hydroxide.

What is the lime formula?

CaO is the chemical formula for lime or quicklime.

How does limestone become slaked lime?

The lime cycle is the process of converting limestone (calcium carbonate) to quicklime by heating, then to slaked lime by hydration, and finally to calcium carbonate through carbonation.

How is Soda-lime made?

Slaked lime is treated with a strong sodium hydroxide solution to make it.

Is slaked lime a basic or an acid?

When calcium hydroxide, commonly known as slaked lime, is dissolved in aqueous solutions, it produces hydroxide ions. As a result, this substance is a base.

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