Answer the following questions:
1. Name three organic and three inorganic acids.
2.
3.
What are indicators ? Name any three indicators and state the colour change
which takes place in (i) ácids (ii) bases.
What are neutral substances ? Give examples of two neutral substances.
You are given three unlabelled bottles A, B and C, containing colourless
solutions, such that one of them is acid, the other being basic and neutral.
How will you distinguish between them by using china rose as an indicator.
5. What do you understand by the term neutralisation ? Describe an activity in
which neutralisation of hydrochloric acid takes place with sodium hydroxide,
using phenolphthalein as an indicator.
4.
Answers
Answer:
1. Organic acid- The organic compounds which act as acids are called organic acids. Inorganic acids – These are the acids derived from mineral sources.
2.Indicators are substances that changes colour when brought in contact with a base or an acid.
1. Blue litmus
It turns into red colour when its in contact with an acid.
It doesn't change its colour when its in contact with a base.
2. Red litmus
It doesn't change its colour when its in contact with an acid.
It turns into blue colour when it is in contact with a base.
3. Methyl orange
It has orange colour in acids.
It has yellow colour in bases.
4. Phenolphthalein
It is colourless in acids.
It turns pink in bases.
3. neutral substance is a substance that shows no acid or base properties , has an equal number of hydrogen and does not change the colour of litmus paper examples water , table salt , sugar etc..
4. Neutral substances: The substances which are neither acid, nor basic and do not affect indicators are called neutral substances. Ex. Distilled water
o find the effect of acidic/basic and neutral solution on the china rose solution as an indicator.
* We can take a fistful of china rose petals in a bowl. Soak the petals in the boiling water for half an hour. On cooling, crush the petals with hand and then filter the mixture. We will get pink coloured clear solution, which can be used as an indicator.
* Now, we will take 1cc of china rose solution in a test tube and to it add few drops of soap solution. Shake the contents. We will notice that colour of the solution changes to green.
* We will notice that pink colour of china rose solution changes to green colour in case of solutions of soap, shampoo, baking soda and limewater. These solutions are basic in nature.
* We will notice that pink colour of china rose solution changes to deep pink colour in case of aerated water, lemon juice, hydrochloric acid and nitric acid. These solutions are acidic in character.
* We will notice that pink colour of china rose solution does not change in case of common salt solution. This solution is neutral in nature.
5. Neutralization: The process due to which an acid completely reacts with a base with the evolution of heat to form salt and water as the products is called Neutralization. It is the reaction between an acid and a base producing salt and water with the evolution of heat.
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Answer:
Above answers are correct I am going to ans only Qno.4
Among the three unlabelled bottles A, B and C containing colourless solutions, the one which turns the china rose deep pink is acidic, the one which turns the china rose green is basic and the one which does not change the colour of china rose is neutral.
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