~ Slaked lime is solid calcium hydroxide. Slaked lime is formed by the addition of water to quicklime:

CaO(s)+H2O(l)→Ca(OH)2(s)


~ Limestone, a sedimentary rock that is dominantly composed of the calcium-bearing carbonate minerals calcite and dolomite.
[ • Calcite is chemically calcium carbonate
(formula CaCO3). • Dolomite is chemically calcium-magnesium carbonate (formula CaMg(CO3)2). ]

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**Introduction:**
Slaked lime and limestone are both forms of calcium carbonate, but they have different properties and uses. Understanding the differences between slaked lime and limestone is important in the study of chemical reactions and equations.

**Limestone:**
- Limestone is a sedimentary rock that is mainly composed of calcium carbonate (CaCO3).
- It is formed over millions of years through the accumulation and compaction of the remains of marine organisms such as coral and shells.
- Limestone is a hard rock and is typically found in sedimentary layers.
- It has a white or grayish color and is commonly used as a building material in the construction industry.
- Limestone is also used in the production of cement, as an aggregate in concrete, and in the manufacturing of glass.

**Slaked Lime:**
- Slaked lime, also known as calcium hydroxide (Ca(OH)2), is formed by adding water to quicklime (calcium oxide, CaO).
- Quicklime is produced by heating limestone to a high temperature, causing it to undergo thermal decomposition.
- Slaked lime is a white, powdery substance that is slightly soluble in water.
- When slaked lime is mixed with water, it undergoes a chemical reaction in which calcium hydroxide is formed.
- This reaction is highly exothermic, meaning it releases a significant amount of heat.
- Slaked lime has several important uses, including as a building material in mortar and plaster, in the production of paper, and as a pH regulator in industrial processes.

**Differences between Slaked Lime and Limestone:**
1. Composition:
- Limestone is composed of calcium carbonate (CaCO3).
- Slaked lime is composed of calcium hydroxide (Ca(OH)2).

2. Formation:
- Limestone is formed through the accumulation and compaction of the remains of marine organisms over millions of years.
- Slaked lime is formed by adding water to quicklime, which is produced by heating limestone.

3. Physical Properties:
- Limestone is a hard rock and is typically found in sedimentary layers.
- Slaked lime is a white, powdery substance that is slightly soluble in water.

4. Uses:
- Limestone is used as a building material, in the production of cement, and in various industrial applications.
- Slaked lime is used in mortar and plaster, in the production of paper, and as a pH regulator.

**Conclusion:**
In summary, slaked lime and limestone are different forms of calcium carbonate with distinct properties and uses. Limestone is a sedimentary rock used as a building material, while slaked lime is a white powder formed by adding water to quicklime and has various applications in construction, industry, and chemistry. Understanding these differences is important in the study of chemical reactions and equations.