This
chart helps to understand bleaching powder – chemical composition, industrial production, and manufacture of bleaching powder in Hasenclever plant and Bachmann’s plant. This Science and Technology chart aims at familiarising students with the subject in a very realistic way and in social context. These delineate the process of life and of the technology that conditions our world today. The students will come to know the intricacies of the phenomenon and how it can be best used for benefit of mankind. Using the latest printing technology the charts are printed on art paper in full colours and are duly laminated on both sides with thick plastic film and fitted with plastic rollers.
Layout:
The chart can be divided into two sections:
Materials :
- Slaked Lime (Calcium Hydroxide): Ca(OH)2
- Brief description: Dry or slaked lime is a white powder obtained by reacting quicklime (calcium oxide) with water.
- Chlorine Gas (Cl2): Cl2
- Brief description: A greenish-yellow gas with a pungent odor.
- Safety Alert: Chlorine gas is toxic, handle with extreme caution in a well-ventilated area.
- Water (H2O): H2O
Process :
- Slaking Lime: )
- Shows an image (or brief description) of quicklime reacting with water to form slaked lime. CaO (s) + H2O (l) → Ca(OH)2 (s)
- Chlorine Gas Introduction:
- Shows an image of chlorine gas being bubbled through a suspension of slaked lime in water.
- Briefly explains that the reaction needs to be controlled to avoid excess chlorine, keeping the temperature below 35°C.
- Chemical Reaction:
- Includes the balanced chemical equation for the reaction between chlorine and slaked lime: Ca(OH)2 (s) + Cl2 (g) → CaOCl2 (s) + H2O (l)
- Highlights that the product, CaOCl2, is bleaching powder (calcium hypochlorite).
- Drying:
- Briefly mentions that the resulting calcium hypochlorite is filtered and dried.
Benefits:
This chart effectively showcases the preparation process of bleaching powder in a clear and concise way. The breakdown into materials and process steps with visuals makes it easy to understand the reaction and product formation.
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