Chlorine | Descriptions, Chemical and Physical Properties, Uses & Facts

Chlorine | Descriptions, Chemical and Physical Properties, Uses & Facts

Unveiling the Power of Chlorine: From Chemical Element to Essential Pool Maintenance


Chlorine, a key element on the periodic table, plays a vital role in various industries and daily life. In this blog, we'll explore the properties, uses, and facts about chlorine, with a focus on its applications in the form of chlorine tablets, pool chlorine, liquid chlorine, calcium hypochlorite, chlorine granules, chlorine powder, and calcium hypochlorite granular.

Chemical Properties:

Symbol: Cl

Atomic Number: 17

Atomic Mass: 35.453 u

Chlorine element is a halogen, belonging to Group 17 of the periodic table of Chemistry. It is a highly reactive, pale green gas with a distinct, pungent odor. Despite its toxic nature in its gaseous form, chlorine and its compounds find various applications due to their powerful disinfectant properties.

Physical Properties:

- State: Gas at room temperature

- Density: 3.214 g/L

- Melting Point: -101.5°C

- Boiling Point: -34.04°C

Chlorine is known for its diatomic molecule structure (Cl2) and is heavier than air, which explains why it tends to accumulate at ground level.

Chlorine Reaction with other Metals

Chlorine, being a highly reactive element, readily engages in various chemical reactions with other elements and compounds. Here are some key reactions involving chlorine:

Combination with Metals:

  1. Chlorine reacts with metals to form metal chlorides. 
  2. The general formula for these reactions is: Metal+Cl2Metal chloride
  4. Example: 2Na+Cl22NaCl
Combination with Hydrogen:

Chlorine reacts with hydrogen to form hydrogen chloride, a diatomic gas with a strong, acidic odor. H2+Cl22HCl
  1. Combination with Non-Metals:

Chlorine reacts with non-metals to form covalent compounds. For example, with oxygen:
  1. This reaction leads to the formation of chlorine oxides.

  2. Displacement Reactions:

  3. Chlorine displaces less reactive halogens from their compounds. The general form is:


  5. Example: Cl2+2KBr2KCl+Br2

  1. Reaction with Water:
    1. Chlorine reacts with water to form hypochlorous acid and hydrochloric acid:Cl2+H2OHOCl+HCl
    2. Cl2+H2OHOCl+HCl
  2. Combination with Alkalis:

  3. Chlorine reacts with alkalis (metal hydroxides) to form chlorides and water:

  4. Reaction with Ammonia:

  5. Chlorine reacts with ammonia to form nitrogen trichloride and hydrogen chloride:

  6. 3Cl2+8NH36NH4Cl+N2

These reactions showcase the versatility of chlorine in forming a variety of compounds with different elements, highlighting its importance in various industrial and chemical processes.

Uses of Chlorine:

1. Water Treatment:

Chlorine is widely used to disinfect water supplies, killing bacteria, viruses, and other harmful microorganisms. This ensures safe drinking water for communities around the world.

2. Swimming Pool Maintenance:

Chlorine tablets, pool chlorine, liquid chlorine, chlorine granules, and chlorine powder are common forms used to sanitize swimming pools, preventing the growth of algae and eliminating harmful pathogens.

3. Chemical Synthesis:

Chlorine compounds are essential in the production of a wide range of chemicals, including PVC (polyvinyl chloride), solvents, and pharmaceuticals.

4. Bleaching Agents:

Chlorine-based compounds, like calcium hypochlorite, are used as effective bleaching agents in the textile and paper industries.

Chlorine Forms in Pool Maintenance:

1. Chlorine Tablets:

Convenient and slow-dissolving, these tablets are often used in automatic chlorinators to maintain a consistent chlorine level in pools.

2. Pool Chlorine:

Available in various forms, such as liquid or granular, pool chlorine is a quick and effective way to shock the pool, especially after heavy use or to address water quality issues.

3. Liquid Chlorine:

Sodium hypochlorite solution is a common form of liquid chlorine used for pool sanitation. It provides immediate disinfection upon application.

4. Calcium Hypochlorite:

Often found in granular or powdered form, calcium hypochlorite is a potent chlorine compound used for shock treatments and continuous pool maintenance.


Chlorine, with its unique properties, plays a crucial role in maintaining the cleanliness and safety of water sources, particularly in swimming pools. Whether in the form of chlorine tablets, pool chlorine, liquid chlorine, or calcium hypochlorite, chlorine-based products are indispensable in ensuring a hygienic environment. As we continue to leverage the power of chlorine for various applications, it remains a cornerstone in the realms of water treatment, chemical synthesis, and industrial processes.

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