What happens chemically when quicklime is added to water filled in a bucket

General
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what happens chemically when quicklime is added to water filled in a bucket

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What happens chemically when quicklime is added to water filled in a bucket?

Answer:

When quicklime (calcium oxide, \text{CaO}) is added to water, a chemical reaction occurs that produces calcium hydroxide (\text{Ca(OH)}_2) and releases a significant amount of heat. This exothermic reaction can be described by the following chemical equation:

\text{CaO} + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{heat}

1. Chemical Reaction Explanation:

  • Quicklime (CaO): Quicklime, also known as calcium oxide, is a white, caustic, alkaline substance.
  • Water (H₂O): When water is added to quicklime, it reacts vigorously.
  • Calcium Hydroxide (Ca(OH)₂): The product of this reaction is calcium hydroxide, commonly known as slaked lime or hydrated lime.

2. Reaction Process:

  • Initial Contact: When quicklime is introduced to water, it begins to dissolve and react almost immediately.
  • Heat Release: The reaction is highly exothermic, meaning it releases a considerable amount of heat. This can cause the water to boil and steam to form if the quicklime is added rapidly or in large quantities.
  • Formation of Slaked Lime: The calcium oxide reacts with water to form calcium hydroxide, which is a less caustic and more stable compound.

3. Practical Implications:

  • Safety Precautions: Due to the exothermic nature of the reaction, it is essential to handle quicklime with care. Adding quicklime to water should be done slowly to control the heat release and prevent splashing of the caustic mixture.
  • Applications: The resulting calcium hydroxide has various applications, including in construction (as a component of mortar and plaster), in water treatment (to adjust pH levels), and in agriculture (to neutralize acidic soils).

In summary, when quicklime is added to water, it undergoes an exothermic reaction to form calcium hydroxide, releasing a significant amount of heat in the process. This chemical transformation is crucial in several industrial and environmental applications.