NCERT Activity 4.7 Class 10 Science Explanation with conclusion

If you are looking for NCERT Science Class 10 Chapter 4 Activity solutions, then you are in the right place. In this post, you will find NCERT Activity 4.7 Class 10 Science Explanation with conclusion.

NCERT Activity 4.7 Class 10 Science 

You are suggested to study NCERT activity 4.7 class 10 science explanation with a conclusion so that you can attempt questions based on activity 4.7 class 10 science.

 Table of Content

    1.   Activity

    2.   Observation

    3.   Conclusion

    4.   Quiz

    5.   ImportantQuestions

    6.   FAQs

    7.   RelatedTopics

Activity 4.7 Class 10 Science

·      Compare the `P^H` of dilute acetic acid and dilute hydrochloric acid using both litmus and universal indicators.

·      Are both acids indicated by the litmus test?

·      Does the universal indicator show them as equally strong acids?

Observation

Litmus paper is a `P^H` indicator that changes colour when comes in contact with acidic or alkaline solutions. It is available in red or blue colour.

Acids change blue litmus paper into red while base (alkali) change red litmus into blue.

Acids	Red litmus paper	Blue litmus paper
Hydrochloric acid	No change in colour	Change into red
Acetic acid	No change in colour	Change into red

 

When blue litmus paper is dipped into a dilute acetic acid solution. It becomes slightly red.

When blue litmus paper is dipped into dilute hydrochloric acid, it becomes red

So this indicates both acetic acid and hydrochloric acid are acidic in nature.

 

Now we add a universal indicator in both acetic acid and hydrochloric solutions and observe the result.

Acids	Universal indicator	PH value
Hydrochloric acid	light pink colour	Approx 2
Acetic acid	yellowish pink colour	Approx 4

 

Universal indicator is also a `P^H` indicator but it has a wide range of PH and provides more clear results.

When a universal indicator is added to dilute acetic acid, it shows `P^H` in the range of 3 to 6 which indicates that acetic acid is a mild acid.

When a universal indicator is added to dilute acetic acid, it shows the `P^H` below 3 (approx 2)which indicates that HCl is a strong acid.

i.      Both litmus and universal indicators show that dilute acetic acid and hydrochloric acids are acidic solutions.

ii.   Universal indicator shows that HCl is stronger than acetic acid.

Activity 4.7  Class 10 Science Conclusion

This activity shows that HCl is completely ionized while acetic acid is only partly ionized, therefore, we can say that hydrochloric acid is a stronger acid than acetic acid.

          Quiz on Activity 4.7 Class 10 Science

Important Question based on activity 4.7 Class 10 Science

1. How are carboxylic acids different from mineral acids from an ionization point of view?

Ans. – Mineral acids are completely ionized but carboxylic acids are partly ionized.

2.   What is a universal indicator?

Ans.- A universal indicator is a P^H made of a solution of several compounds that indicate the acidity or alkalinity of different solutions.

3. What is the conclusion of activity 4.7 class 10 science?

   

Ans-  It is concluded that `HCl` is stronger than `CH_3COOH`.

4. What is the aim of activity 4.7 class 10 science?

 Ans - The aim of activity 4.7 is to find whether the given solutions are acidic or basic.

5. Why hydrochloric acid is stronger than `CH_3COOH`?

  Ans -  Hydrochloric and completely ionised while acetic acid ionised partially.

6. Does the litmus test show which acid is strong?

 Ans-  No, the litmus test doesn’t show which acid is strong.

FAQs

1. Why litmus paper is used in this activity 4.7 Class 10 Science?

 Ans - Litmus paper is used as an indicator based on colour change with acidic or basic solutions.

2. How does blue litmus paper change when dipped in hydrochloric acid solution?

Ans -  Blue litmus paper changes to red colour.

3. What colour change is observed when blue litmus paper is dipped in acetic acid?

Ans - There is no change in colour.

4. Does the litmus paper test indicate whether `HCl` and `CH_3COOH` are acids?

Ans - Yes, litmus paper changes its colour (blue to red) with both `HCl` and `CH_3COOH` showing both are acidic.

5. Is universal indicator better than litmus paper in activity 4.7 class 10 science?

Ans-  Yes, the universal indicator is better than litmus paper as it has a wide PH range.

6. What colour does the universal indicator show with `HCl`?

Ans-  Universal indicator shows pink colour with `HCl`.

7. What `P^H` value is shown by a universal indicator in `HCl`?

 Ans - Universal indicator shows `P^H` value approx 2 (below 3).

8. Does the universal indicator show a clear difference between `HCl` and `CH_3COOH`?

Ans - Yes, universal does. The universal indicator has a wide range of `P^H`.

9. What is the `P^H` range shown by the universal indicator in acetic acid?

Ans - It shows a `P^H` range of 3 to 6.

Related Topics

1.  Activity 4.8 Class 10 Science

2.  Activity 4.6 Class 10 Science

3. Solution of Chapter 4 Carbon and its Compounds

4. MCQ Questions of Chapter 4

5. Extra Questions of Chapter 4

6. Solutions of Class 10 Science all chapters