INDICATORS - ASL Session by Mrunmai Ainule l Grade X l Principals Gurukul l Latur l

[00:00:01]Har Krishna hello everyone this is my student of grade 10 and today I am here to EXPLAIN YOU ONE OF THE WONDERFUL TOPIC FROM chemistry that is indicators now you must be wondering that how are indicators useful in chemistry we USE INDICATORS IN OUR COUNTRY but the indicators which you are thinking and which we use in chemistry are completely different now let us see what are exactly indicators in our chemistry An indicator in the D that changes color when it is added into acidic or a basic solution. Now one more question arises what is the need to identify whether the solution is acidic in nature or what is the basic in if solution is a basic IN NATURE WHAT I WANT TO DO WITH this but for our health it doesn't matter whether a solution we are consuming is acidic in nature or in a basic in nature. So now suppose I have given you three beers. I know that in one beaker there is a acidic solution. In one beaker there is a basic solution and in one there is a neutral solution. But I don't know it mean in [laughter] which solution is there and I have asked one of you to identify in which acidic solution is there and in big phic solution is there.

[00:01:21]Now we know that acids are so intense and basis or beta. Now my question will be asked that whether you tell the struct yes definitely the answer will be no BECAUSE WE ALSO KNOW THE PROPERTY of acids and bases that they are in nature which are harmful for us. NOW WHAT CAN I DO? I want that which one is acidic solution and which one is basic solution? I DON'T KNOW ANYTHING. So now this wonderful indicators will help us to identify which one is acidic in nature and which one is basic in nature.

[00:01:56]So indicators so indicators are divided into mainly two types that are by changing color and by changing order. By changing order indicators are also known as all factory indicator and by changing color indicators are divided into two types that are natural indicators and sensor indicators. Now natural indicators we are they are obtained from a natural thing they may be from animals unisellular multisellular or they may be from the plant and specific indicators are indicators those we prepare in laboratory a laboratory with the help of chemicals and many other things. So let us start with natural indicators. Moving towards which we use we have heard many years. But what exactly is this? It is the plant plant for it is obtained from the plant fulation belonging to the dividend of group called halopita. Its original color is purple. Yes right purple. And it changes it color into red when it is added into the acidic solution. And it changes it color into blue when it is added into basic solution. Now how exactly is this paper?

[00:03:12]Now when we obtain the plant legend it will grind solution in red and then some amount of acid is added then it changes into red color and then paper is dipped in and then the paper is dry for some then we will get this red color paper and if we will add some amount of base in that solution then we will get this blue color.

[00:03:38]This was all about the lesson. Now let us move towards second color changing indicator that is turmeric. Yes turmeric which we use in our food hy turmeric right. It is also natural color changing indicator it natural color is yellow and when it is added into the acidic solution it color element are change but when it is added into the basic solution it color changes into reddish brown color. Yes. So that's the reason why we observe that whenever a healthy stain remains on a white pa it when we add the soap on it it changes into the reddish brown color. Now let's move towards our next indicator that is red cabbage indicator. Now when we listen the red cab we will get concluded that it's a red cab in image we can see THAT IT IS A COLOR. YES, but though it's rainy red cabbage but it it is in a purple color.

[00:04:41]So it is also a natural color changing indicator it original color is purple.

[00:04:47]Yes, this point we should always remember because commonly in exams we will get confused with red cabbage as we will they will ask that what is the natural color of red cabbage that we will get confused because in name it is red but it natural color is purple. So be careful with this point. And it changes into red color when it is added into acidic medium. And it changes it into green color when it is added into basic medium. And we use red cabbage same as we use indicator. Moving towards the next point that is synthetic color changing indicator.

[00:05:24]Commonly we use only two mainly synthetic color changing indicator that methile orange and filthy.

[00:05:33]Methyl orange is a synthetic color change indicator. It soluble color in orange. It in acidic solution it [laughter] changes it color into red color and in bic solution it changes it color into yellow color. It is prepared in laboratory and if we become helium then we can also prepare this methane. I would like I would most enjoy this thing. Moving towards the next indicator that is phenox. It is also a natural color training indicating indicator. It is colorless in solution.

[00:06:09]Yes. Same as water. Water is colorless.

[00:06:13]Yes. We say that the color of water is blue. But actually water is colorless and phenyl is also a colorless solution.

[00:06:21]When it is added into acidic solution, it changes it. It doesn't change it color. It remains colorless in the acidic acid mixture but when it is added into basic solution we will observe that it changes its color into pink. Moving towards the next now let us recap how many indicators we have learned till now. So in this flow part we will be seeing that indicator it original color it coloring acid and it coloring bases.

[00:06:54]So starting with the first ingredient that is lemon. It natural color was purple. It changes it color into acidic medium into red. It changes it color into blue when it is added into basic solution. Second is turmeric. It natural natural color is yellow. When it is added into acidic solution no change means it remain into yellow color only.

[00:07:20]And when it is added into basic solution it changes into reddish brown color. Now next is reduced whose natural color is purple which is the most important point as point. When it is added into acidic solution it changes its color into red color and when it is added into basis it changes it color into green color. Moving towards our next indicator that is hydria. Hydria is a flower. Flower. Yes.

[00:07:53]It we can observe hydria anywhere. It it color is a color blue. Of course is a flower means it will have many colors.

[00:08:02]When it is added into the acid solution it changes into color it color into blue color and when it is added to basic solution it changes its color into pink color. Moving towards the next next indicator that is China root. China roots its common name is yes the flower which we offer to our favorite god Lord Ganesha. Its natural color is red and it changes its color into magenta when it is added into acidic solution and it changes it color into yellow or green any one color when it is added into basic solution. Next one is geranium.

[00:08:45]Geranium. Geranium is also a flower which is reddish color and it is pink and it is pink painting when it changes pink color when it is added into acidic solution and changes into green color when it is added into when it is added into the basic solution. Next is puna.

[00:09:12]So moving towards our next slide we will see that black which is natural in color. Now one thing have you observed in red cabin we have seen that the name was red cabbage but it natural color was purple. Same here also blackberry.

[00:09:32]Blackberry but it natural color is purple. The name indicates blackberry but natural color is purple. So this point is also important. Moving toward when it is added into the acidic solution it changes into red color and when it is added into the basic solution changes into the purple color. Moving towards the next indicator which synthetic indicator means those are prepared in laboratory. First one is method. Method is a synthetic indicator whose natural color is orange. As the name indicates the when it is added to the acidic solution it changes its color into red and when it is added to the basic solution it changes it color into yellow. Next one is the spinner of which is the most commonly used indicators right you have heard it many times. So it natural color is colorless. When it is added into acidic solution the color remains colorless and when it is added into the basic solution color it changes it color into pink color. Yes right pink color. Moving towards our next point that is all factory indicator. All factory indicators means indicative changes in smell when they when they come in contact with acidic solution or basic solution. common we see three main oil factor indicators that are onion ba and clo. So let us study in detail what exactly happen with these indicators. So onion when onion comes in contact with acidic solution it smell remains same as the smell of onion is in natural solution. So when it is in the contact with basic solution it will react completely mean it will have no smell.

[00:11:26]So next moving towards the banula. So when it is added into the acidic solution it smell remains same and but when it is added to the basic solution the smell there is no smell it will retain it smell completely but in progress the case is completely different when it is added to the acidic solution the smell will remain same. So but when it is added to the basic solution this less smell will do mean if completely smell is not managed some amount of the smell is remain. So one trick we can make here we can take onion from here and be from here on we can make remember that these two are same but pro is different. So this was all from my side. I hope you all are clear with the topic indications. Har Krishna.

[00:12:17]Thank you.