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Understanding Lime: Unveiling the Secrets of Ca(OH)₂



Calcium hydroxide, more commonly known as slaked lime or hydrated lime, is a chemical compound with the formula Ca(OH)₂. It's a white crystalline powder that's widely used in various industries, from construction to agriculture. While the chemical formula might seem intimidating, understanding its properties and applications is surprisingly straightforward. This article will demystify Ca(OH)₂ and explore its significance in our everyday lives.

1. Formation and Properties of Ca(OH)₂



Calcium hydroxide is formed through a chemical reaction between calcium oxide (CaO), also known as quicklime, and water (H₂O). This process, called slaking, is highly exothermic, meaning it releases a significant amount of heat. The reaction is represented as follows:

CaO(s) + H₂O(l) → Ca(OH)₂(aq)

The resulting solution is known as limewater, a weakly alkaline solution. Solid calcium hydroxide is a white powder that is sparingly soluble in water, meaning only a small amount dissolves. Its alkaline nature is a key characteristic, making it a strong base. This basicity is crucial to many of its applications.

2. Applications in Construction and Infrastructure



One of the most prominent uses of Ca(OH)₂ is in the construction industry. It's a crucial component of mortar, a binding material used in bricklaying. When mixed with sand and water, it forms a paste that hardens over time, binding the bricks together. This hardening is a result of the calcium hydroxide reacting with carbon dioxide (CO₂) from the air, a process called carbonation:

Ca(OH)₂(s) + CO₂(g) → CaCO₃(s) + H₂O(l)

This reaction forms calcium carbonate (CaCO₃), the main component of limestone, making the mortar strong and durable. Similarly, Ca(OH)₂ is used in plaster and concrete, contributing to their strength and setting properties.


3. Applications in Agriculture and Wastewater Treatment



Beyond construction, calcium hydroxide finds applications in agriculture as a soil amendment. It helps to neutralize acidic soils, making them more suitable for plant growth. By raising the pH of the soil, it improves nutrient availability and reduces the presence of harmful elements. Farmers often use it to improve the yield and quality of crops.


In wastewater treatment, Ca(OH)₂ acts as a flocculant, helping to remove impurities from the water. It neutralizes acidic wastewater and promotes the coagulation and sedimentation of suspended solids. This process is crucial for purifying water and protecting the environment.

4. Other Uses and Safety Precautions



Calcium hydroxide has diverse applications extending beyond construction and agriculture. It's used in the food industry as a food additive (E526) to regulate acidity and in sugar refining. It also finds use in the manufacturing of various chemicals, including calcium chloride and bleaching powder.


While generally safe, handling calcium hydroxide requires certain precautions. Direct contact with skin and eyes can cause irritation, so protective gear like gloves and goggles should be worn. Inhalation of the dust can irritate the respiratory system. Proper ventilation is crucial when working with calcium hydroxide, and any accidental ingestion should be treated immediately with a medical professional's assistance.


5. Actionable Takeaways and Key Insights



Calcium hydroxide (Ca(OH)₂) is a versatile compound with numerous applications.
Its alkaline nature is central to its functionality in various industries.
The chemical reactions of Ca(OH)₂, including slaking and carbonation, are crucial to understanding its properties and uses.
Safety precautions should always be followed when handling Ca(OH)₂.
Understanding the basic chemistry behind Ca(OH)₂ allows for informed decision-making regarding its applications.

FAQs



1. Is limewater the same as slaked lime? Limewater is a solution of calcium hydroxide in water, while slaked lime refers to the solid calcium hydroxide powder.

2. Is calcium hydroxide harmful to the environment? In appropriate quantities, Ca(OH)₂ isn't considered environmentally harmful. However, improper disposal can lead to localized pH changes in water bodies.

3. Can calcium hydroxide be used to treat acidic indigestion? No. Although alkaline, it's not suitable for internal consumption due to its corrosive properties. Antacids are specifically designed for this purpose.

4. What is the difference between quicklime and slaked lime? Quicklime (CaO) is the anhydrous form of calcium oxide, while slaked lime (Ca(OH)₂) is the hydrated form, produced by reacting quicklime with water.

5. Where can I purchase calcium hydroxide? Calcium hydroxide is available from chemical suppliers, some agricultural supply stores, and online retailers. Always follow safety guidelines when handling and storing the product.

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Calcium hydroxide Ca (OH)2 slaked lime, Ca (OH)2 slaked lime, 27 Sep 2023 · Calcium hydroxide Ca (OH)2 is the chemical formula of slaked lime. Here, in this article you will study about the preparation, properties, chemical reactions and uses of Ca (OH)2. Slaked lime is sparingly soluble in water. The solubility of slaked lime decreases with rise in …

Calcium Hydroxide – Explanation, Properties, Uses and FAQs Calcium hydroxide is commonly referred to as slaked lime and is described by the chemical formula Ca(OH) 2. It is also a white inorganic compound that has a powdery appearance in its solid-state. However, in its crystalline form, it has a colorless appearance.

Calcium hydroxide - Wikipedia Calcium hydroxide (traditionally called slaked lime) is an inorganic compound with the chemical formula Ca (OH) 2. It is a colorless crystal or white powder and is produced when quicklime (calcium oxide) is mixed with water. Annually, approximately 125 million tons of calcium hydroxide are produced worldwide. [8]

What is hydrated lime? - Lhoist Hydrated lime, Ca(OH) 2, also known as calcium hydroxide, is a strong alkali produced by adding water to quicklime (calcium oxide). This process, called slaking, converts the oxides into hydroxides and generates heat.

Effects of organic additives on calcium hydroxide crystallisation ... 1 Jan 2021 · Sucrose and lignosulfonate reduce the crystallite size of Ca (OH) 2. Lime slaking in sucrose solutions leads to Ca (OH)2 with irregular shape. Lime slaking in presence of lignosulfonate leads to plate-like Ca (OH) 2 crystals. Effects of additives are enhanced when introduced before slaking.

Calcium Hydroxide | Ca(OH)2 | CID 6093208 - PubChem Calcium dihydroxide is a calcium hydroxide. It has a role as an astringent. CALCIUM HYDROXIDE is a small molecule drug with a maximum clinical trial phase of IV (across all indications) and has 4 investigational indications. View More...

Calcium Hydroxide | Formula, Properties & Application Calcium hydroxide, often known as slaked lime or hydrated lime, is a commonly used chemical compound with the chemical formula Ca(OH) 2. This inorganic compound is colorless crystal or white powder, created by the reaction of calcium oxide, …

Calcium Hydroxide Formula - Uses, Properties and Examples Calcium hydroxide, also known as slaked lime or hydrated lime, has the chemical formula Ca(OH)2. It is composed of one calcium ion (Ca2+) and two hydroxide ions (OH-) bonded together.

Properties of Calcium Hydroxide - BYJU'S Calcium hydroxide is formed by the action of water on calcium oxide, also called slaked lime, Ca(OH)2. A small proportion of it dissolves when combined with water, forming a solution known as limewater, the remainder remaining in a suspension called lime milk.

Calcium Hydroxide - Chemistry LibreTexts 30 Jun 2023 · Calcium hydroxide, Ca (OH) 2, forms colorless crystals (resulting in white powder) and is obtained by mixing calcium oxide with water (calcium hydroxide is also called slaked lime).

Calcium hydroxide - chemeurope.com Calcium hydroxide, also known as slaked lime, is a chemical compound with the chemical formula Ca (OH) 2. It is a colourless crystal or white powder, and is obtained when calcium oxide (called lime or quicklime) is mixed, or "slaked" with water.

Calcium hydroxide - Sciencemadness Wiki 6 Jun 2018 · Calcium hydroxide, also known by the names slaked lime and hydrated lime, is an inorganic compound with chemical formula Ca(OH) 2. It serves as an intermediate amongst basic calcium compounds, as it can be converted to both calcium oxide …

Calcium Hydroxide Formula- Structure, Uses, Properties - Adda247 14 Sep 2023 · Ca (OH)2 is the chemical calcium hydroxide formula, often known as lime that has been slaked or hydrated lime. In its solid state, it is a white inorganic compound with a powdery appearance. It is made up of one calcium ion (Ca2+) coupled with two hydroxide ions (OH-).

Hydrated Lime (Calcium Hydroxide) 25kg Bag - H&I Chemicals Ltd Hydrated lime (calcium hydroxide), traditionally called slaked lime, is an inorganic compound with the chemical formula Ca (OH)2. It is a colourless crystal or white powder and is obtained when calcium oxide (lime or quicklime) is mixed, or ‘slaked’ with water. It has many names including builders’ lime, slack lime, or pickling lime.

Calcium Hydroxide (Ca(OH)₂) - Definition, Structure ... - Examples 29 Jan 2025 · Calcium hydroxide reacts with carbon dioxide to form calcium carbonate, a common reaction used in the construction industry to cure lime mortar and plaster. This process is also critical in the natural carbonation of lime-based materials. Equation: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O; Reaction with Acids

Chemistry:Calcium hydroxide - HandWiki Calcium hydroxide (traditionally called slaked lime) is an inorganic compound with the chemical formula Ca (OH) 2. It is a colorless crystal or white powder and is produced when quicklime (calcium oxide) is mixed with water. It has many names including hydrated lime, caustic lime, builders' lime, slaked lime, cal, and pickling lime.

limestone, quicklime and slaked lime - chemguide Limestone, quicklime and slaked lime. This page looks at the origin and uses of limestone, and its conversion into quicklime, CaO, and slaked lime, Ca(OH) 2. Limestone and marble. Chemically, limestone is calcium carbonate. It is a sedimentary rock formed from the shells and skeletons of marine creatures which fell to the bottom of ancient seas ...

calcium hydroxide - Encyclopedia Britannica calcium hydroxide (Ca (OH)2), a soft white powder that is widely used as a raw material in the chemical industry. It forms when calcium oxide is mixed with water. The compound has two hydroxide ions (OH −) for each ion of calcium (Ca 2+).

Lime (Calcium Hydroxide) for use in pH Neutralization Systems Calcium Hydroxide [Ca(OH) 2]. Also commonly referred to as slaked lime or hydrated lime; calcium hydroxide is formed as a result of hydrating lime (calcium oxide, CaO). Lime is by far the most economically favorable alkaline reagent to use for acid neutralization. Lime is significantly cheaper than caustic (NaOH), but is much more difficult to ...

pH of Calcium Hydroxide - What is the pH Chemical formula: Ca(OH) 2. Also known as: Slaked lime, Milk of lime, hydroxide, Pickling lime, Hydrated lime, Portlandite, Calcium hydrate