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Writer's pictureAkash Pandey

What is Calcium Hydroxide?

Calcium hydroxide is usually called slaked lime and is described with the aid of the chemical formula Ca(OH)2. It is likewise a white inorganic compound that has a powdery appearance in its stable-kingdom.

The other names of this compound may be given as slack lime, hydrated lime, caustic lime, and pickling lime. In preferred, the calcium hydroxide is ready via mixing calcium oxide (which is also called quicklime) and water.


Do You Know : Rajasthan Lime is the big company of Manufacturers Lime Powder in India.


Calcium Hydroxide Explained

Also, the chemical response between the calcium chloride and sodium hydroxide dissolved in water (aqueous CaCl2) yields this compound. The structural illustration of a Ca(OH)2 molecule may be illustrated beneath.

The calcium hydroxide molecules are held collectively via ionic bonds among the 2 hydroxide ions (OH–) and calcium ions (Ca2+). Unprotected exposure to this compound may additionally show risky to human beings by main to skin infection and chemical burns. Exposure to the focused Ca(OH)2 can lead to damage to the lungs and even blindness.

Physical Properties

Let us take a look at many of the bodily houses of calcium hydroxide as listed below:

Ca(OH)2 has a shape of hexagonal crystals.

This compound is not very soluble in water. But, its solubility reduces with an growth in temperature. For suppose, its solubility at solubility is 1.73 g/L at 20℃ and at zero℃ is 1.89 g/L.

The solubility product (Ksp) of the calcium hydroxide can be given as five.5 * 10-6.

Chemical Properties

Let us look at many of the chemical residences of calcium hydroxide, as indexed beneath.

The calcium hydroxide is quite soluble in acids and glycerol, however it's far barely soluble best in water. It yields an answer that acts as a moderate base (called limewater) while it's far dissolved in water to a saturation point.

The lime water reacts with acids and bureaucracy salts.

The saturated calcium hydroxide answer in water additionally reacts with and dissolves the metals which include aluminum.

It additionally reacts with carbon dioxide and bureaucracy calcium carbonate (CaCO3). In preferred, this response may be known as carbonation.

Why is Calcium Hydroxide much less Soluble in Water?

Calcium hydroxide is likewise referred to as slaked lime in popular is much less soluble in water however, while its temperature is improved, it starts achieving its melting factor and decomposes its material. The motive for this much less solubility is due to a lower in the lattice strength in hydroxide salts. The solution shaped via the response of calcium hydroxide and water is called milk of lime. Unlike water, Calcium hydroxide is easily soluble in acids and glycerol therefore, it's far used as a pH corrector to reduce a solution’s acidity.

Uses of Calcium Hydroxide

There are many specific uses of calcium hydroxide, and some of them are listed below. Content to get it , Contact Now : Rajasthan Lime -Let us have a have a look at the ones.


  • Ca(OH)2 may be used within the paper industry throughout the Kraft method, which converts timber into wood pulp.

  • In the sewage remedy method, calcium hydroxide can be used as a flocculant or clarifying agent.

  • It is an crucial compound in ammonia practise.

  • Generally, the cucumber pickling is carried out with the help of Ca(OH)2.

  • Also, this compound is used as a pH modifier due to its basicity.

  • The manufacturing of numerous plastics entails using calcium hydroxide as a primary factor.

  • In root canal procedures, this compound is utilized in filling the human tooth cavities.

  • We can use it in insecticides, production of ebonite, and hair care products.

  • Calcium hydroxide can be used within the leather-based industry to separate the fur or hair from the animal hide.

  • Sugarcane and Sugar beets are processed through carbonation, which includes the use of Ca(OH)2.


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