What Is Slaking Of Lime?

What Is Slaking Of Lime?

May 23, 2023 Off By Berry Mathew

Are you curious to know what is slaking of lime? You have come to the right place as I am going to tell you everything about slaking of lime in a very simple explanation. Without further discussion let’s begin to know what is slaking of lime?

Lime, a versatile and widely used material, undergoes a process called slaking to transform it into a more workable and effective form. Slaking of lime involves a chemical reaction that converts quicklime (calcium oxide) into hydrated lime (calcium hydroxide). In this blog post, we will delve into the concept of slaking of lime, its purpose, the reaction involved, and its applications in various industries.

What Is Slaking Of Lime?

The slaking process is employed to convert quicklime, which is a solid white crystalline substance, into a more manageable and useful hydrated lime. Quicklime is highly reactive and needs to be converted into a less caustic and more stable form before it can be utilized in applications such as construction, agriculture, water treatment, and more.

The Chemical Reaction:

The slaking of lime involves an exothermic chemical reaction between quicklime (CaO) and water (H2O). This reaction is as follows:

CaO + H2O → Ca(OH)2

In this reaction, quicklime combines with water to form calcium hydroxide, also known as hydrated lime. The reaction releases a significant amount of heat due to its exothermic nature. The resulting hydrated lime is a white, fine powder that is more stable, less caustic, and easier to handle than quicklime.

Key Aspects Of Slaking Of Lime:

  1. Importance Of Water:

Water plays a crucial role in the slaking process. It not only initiates the chemical reaction but also acts as a medium to facilitate the conversion of quicklime into hydrated lime. The amount of water used affects the speed and completeness of the slaking process, with an optimal water-to-lime ratio ensuring efficient slaking.

  1. Exothermic Reaction:

The slaking reaction is exothermic, meaning it releases heat. This heat is a result of the chemical reaction between quicklime and water. The exothermic nature of the reaction makes it necessary to control the slaking process carefully to prevent overheating or excessive temperature rise.

  1. Slaking Time:

The slaking process requires a sufficient amount of time for the reaction to complete. The time taken for slaking can vary depending on factors such as the particle size of quicklime, the water-to-lime ratio, and the specific application requirements. Adequate time allows for complete conversion of quicklime into hydrated lime.

Applications Of Hydrated Lime:

Hydrated lime, the product of the slaking process, finds applications in various industries, including:

  1. Construction Industry:

Hydrated lime is widely used in construction applications. It is used in mortar and plaster mixes to enhance workability, improve bonding, and provide better durability. Hydrated lime is also utilized in soil stabilization, creating a stable base for roads, foundations, and other structures.

  1. Water Treatment:

Hydrated lime plays a vital role in water treatment processes. It is used for pH adjustment, reducing acidity in water and wastewater treatment systems. Additionally, hydrated lime is utilized in the treatment of drinking water to remove impurities and improve water quality.

  1. Agricultural Applications:

In agriculture, hydrated lime is utilized to modify soil pH, particularly in acidic soils. It helps neutralize acidity, improves nutrient availability to plants, and enhances soil fertility. Hydrated lime is also used for odor control in livestock facilities and as a component in certain fertilizers.

  1. Environmental And Industrial Uses:

Hydrated lime finds applications in environmental and industrial settings. It is utilized in flue gas desulfurization (FGD) processes to remove sulfur dioxide from exhaust gases emitted by power plants and industrial facilities. Hydrated lime is also used in the manufacturing of paper, chemicals, and various industrial products.


The slaking of lime is a vital process that converts quicklime into hydrated lime through an exothermic chemical reaction with water. This reaction transforms quicklime into a more manageable, stable, and less caustic form. Hydrated lime finds widespread applications in construction, water treatment, agriculture, and various industrial sectors. Understanding the slaking process and the benefits of hydrated lime allows for its effective utilization in diverse industries, contributing to enhanced efficiency and performance in a range of applications.


What Is Slaking Of Lime In Chemistry?

The chemical formula for slaked lime is Ca(OH)2.

What Is The Meaning Of Slacking Of Lime?

Slaked Lime: Product Description

Hydrated lime also called slaked lime is produced when water is added to calcium oxide (CaO, or quicklime). The result of this mixing of water and calcium oxide (quicklime) is an exothermic reaction known as slaking. The slaking reaction produces calcium hydroxide, (Ca(OH)2).

What Is Slaking Of Lime Class 10?

Methods of preparation of calcium hydroxide

From quick lime: The addition of a limited quantity of water breaks the lumps of lime. This process is called as slaking of lime.

What Is The Setting And Slaking Of Lime?

Setting: The process of hardening lime after it has been converted into paste form is known as the setting. It is quite different from mere drying. Slaked Lime The product obtained by slaking of quick lime is known as the slaked lime or hydrate of lime.


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