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Bleaching powder smelled strongly of chlorine because it reacts with CO² from the atmosphere to produce chlorine and calcium carbonate.

CaOCl² + CO² ----------- CaCO³ + Cl²


Bleaching powder is calcium oxychloride. Its formula is CaOCl². It is also called chloride of lime.


Bleaching powder is actually a mixture of calcium chloride, calcium hydroxide and calcium hypochlorite.

Hence, it is not a single salt. It is not completely soluble in water as it composed of heavy salts, which are known to be insoluble in water.



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Explanation of why bleaching powder smells strongly of chlorine and does not dissolve completely in water:

Composition of Bleaching Powder:

Bleaching powder is a white powder that is used as a disinfectant, bleaching agent, and oxidizing agent. Its chemical formula is CaOCl2, which means it contains calcium, oxygen, and chlorine. Bleaching powder is made by reacting calcium hydroxide with chlorine gas. The reaction produces calcium hypochlorite, which is the active ingredient in bleaching powder.

Strong Smell of Chlorine:

Bleaching powder smells strongly of chlorine because it contains calcium hypochlorite. When calcium hypochlorite dissolves in water, it releases hypochlorous acid (HOCl) and calcium ions. The hypochlorous acid then reacts with water to form hypochlorite ions (OCl-). These hypochlorite ions are responsible for the strong smell of chlorine.

Insolubility in Water:

Bleaching powder does not dissolve completely in water because it is a sparingly soluble salt. Calcium hypochlorite is only slightly soluble in water, which means that it does not dissolve completely. When bleaching powder is added to water, it forms a suspension of fine particles that settle to the bottom over time.

Conclusion:

In summary, bleaching powder smells strongly of chlorine because it contains calcium hypochlorite, which releases hypochlorous acid and hypochlorite ions when dissolved in water. Bleaching powder does not dissolve completely in water because it is a sparingly soluble salt.