Okay with this I would like to review one more thing. See this is bleaching powder is one of the compounds that is found with the help of sodium chloride NaCl. The common salt that we use in our kitchens. Yes see to make this we require chlorine gas right? And you would remember that chlorine is one of the products the byproducts that gets formed when we do electrolysis of NaCl aqua solution of Nacl.
When we pass electricity through a solution of water and NaCl chlorine gas is also getting involved and this chlorine gas could be used to make bleaching powder that's what makes NaCl so great and important. Because is can be used to make many other chemical products. So now with this lets go ahead and see what are the uses of bleaching powder. So the first is it is used as oxidising agent in chemical industries.
See bleaching powder is a very good oxidising agent. Now what do I mean by that? So you would recall that oxidation is oxygens addition meaning if oxygen is getting added to any element or compound. That means that they are going under oxidation. For example carbon plus oxygen this gives us carbon dioxide.
So here oxygen was getting added to carbon that means carbon is going under oxidation. It is getting oxidised and we are getting a new compound altogether. So bleaching powder is a very good oxidising agent this means that this can easily oxidize other compounds and elements. It can easily add oxygen to other compounds and elements. And so whenever this is a requirement it would require to add oxygen to something in chemical industries we use bleaching powder as oxidising agent.
Now another uses is to decolor or bleach certain materials. For example if you want to decolor cotton or linen in textile industries. See my favorite T-shirt is black in color but it is made up of cotton cotton material and cotton is not naturally black in color. So how did this color happen to come over here? So I guess the makers of the T-shirt they would have put the cotton T-shirt into a black color dye and the molecules of the dye they would have got stuck on this T-shirt and that's how my T-shirt appears black in color.
So now when I put this in bleaching powder the molecules of the bleaching powder they will oxidize the black color molecules of the dye and then chemical reaction happens and a new compound gets formed and this has lost it's black color and that's how my T-shirt it looses it's black color it has become faded. So that how you can use bleaching powder in texting industries to bleach cotton and linen you can also use it to bleach your jeans and give it nice shaded look but be very careful while trying this at home.
Okay we also use bleaching powder to decolorize wood pulp in the paper industry. See the paper that we use is very white in color but it is made from wood pulp which is not very white in color right? So to decolorize this wood pulp we use bleaching powder and similarly we also use it to bleach or remove stain from clothes.
See whenever there is some stain or some color mark on your clothes that's very strong color right? And to remove the color or to decolorize it we can use bleaching powder for the same thing. One more use case of bleaching powder is for disinfecting water. See water can have many microorganism in it that can be very harmful for the human body. So when we mix bleaching powder and water it gives off chlorine and chlorine is toxic for the microorganisms it even kills them.
Ca OH 2 is precipitated in concentrated solutions. Reason to bleaching property is hypochlorite ion OCl -. Colourful things are oxidized by atomic oxygen 'O' which is formed by OCl - ion. Atomic oxygen is very reactive. A suspension of bleaching powder in water is added dropwise to water and stirred. In earlier times, chlorine gas Cl 2 was used. But due to inconvenience of transporting heavy gas cylinders of chlorine, this method is abandoned.
Gaseous CO 2 dissolve well in the water. That forms carbonic H 2 CO 2 acid. Carbonic acid can release Cl 2 from bleaching powder. Hypochlorous acid is not stable and again hydrolysis to chlorine gas. Bleaching powder can oxidize another substances. Therefore bleaching powder can behave as an oxidizing agent. Add bleaching powder to acidic KI solution. Purple colour I 2 is emitted.
When I 2 contact with farina, you can see purple colour. Bleaching powder reacts with ammonia and give calcium chloride CaCl 2 , nitrogen gas N 2 and water as the products. Sodium hypochlorite NaClO can be used as a disinfectant. HOCl decomposes to HCl, atomic oxygen atom and water. Atomic oxygen is very reactive and is reduced to O 2- readily. With that step, coloured thing is oxidized to get colourless. Bleaching powder manufacturing process, uses, reactions Bleacing powder is calcium hypochlorite Ca OCl 2.
In this tutorial, we study about followings. What is bleaching powder? Manufacturing process Uses of bleaching powder Reactions of bleaching powder What is bleaching powder Bleaching powder is a white - yellowish powder which very well dissolves in water.
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