Why do we store silver chloride in dark coloured bottles?
Silver Chloride reacts with sunlight to form black metallic silver. Therefore, in order to prevent this reaction from taking place, we have to prevent exposure of silver chloride to bright sunlight. This is also how film works and why photographs are usually developed in a dark place.
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When silver chloride is hit with light, it breaks down into elemental silver and chlorine gas:
2 AgCl --> 2 Ag +
In this case, the amount of chlorine gas is generally small enough that there's no danger. However, during this process the silver chloride itself is contaminated with silver, which darkens it.
The silver nitrate you have used is stored in dark bottles, to avoid light entering it.
Example : 2AgCl ------> 2Ag + Cl2
Here, silver chloride reacts with sunlight and decomposes to form silver and chloride. Hence, to prevent it from decomposing, it is stored in dark-coloured bottles.
Hope this helps... : )
Dark coloured bottles interrupt the path of light such that light cannot reach silver chloride in the bottles and its decomposition is prevented. It is known that silver chloride decomposes to silver and chlorine in the presence of light.
This is shown in the reaction given below:
2AgCl (s) --------------------> 2Ag(s) + Cl2(g)
So, as to prevent the exposure of silver chloride into sunlight and hence prevents its decomposition, it is stored in dark coloured bottles so as to prevent the entry of sunlight.
AgCl2- Ag + Cl2
In a combination reaction, a substance is formed as a result of chemical combination, while in a decomposition reaction, the substance breaks into new substances.
For example:? The digestion of food in our body is accompanied by a number of decomposition reactions. The major constituents of our food such as carbohydrates, fats, proteins, etc.,decompose to form a number of simpler substances.? These substances further react, releasing large amounts of energy, which keeps our body working.
The general equation that describes a decomposition reaction is:
Types of Decomposition Reactions
Decomposition reactions can be classified into three types:
Thermal decomposition reaction
Electrolytic decomposition reaction
Photo decomposition reaction
Thermal decomposition is a chemical reaction where a single substance breaks into two or more simple substances when heated.