Activity 14.4 Class 8 Science Chapter 14 Solution

Activity 14.4 Class 8 Science Chapter Chemical Effects of Electric Current

 Today we will discuss activity 14.4 class 8 science chapter 14 chemical effects of electric current.  You should also go through activity 14.3 chapter 14. In this activity 14.4, we will discuss whether distill water conduct electricity or not?

You are suggested to study NCERT activity 14.4 class 8 science explanation with a conclusion so that you can attempt questions based on activity 14.4 class 8 science.

Activity

 

   ·    Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle.

   ·    (You may obtain distilled water from your school science lab.

   ·     You may also get distilled water from a medical store or a doctor or a nurse).

   ·     Use the tester to test whether distilled water conducts electricity or not.

  ·    What do you find?

  ·    Does distill water conduct electricity?

  ·    Now dissolve a pinch of common salt in distilled water.

  ·     Again test. What do you conclude this time

Observation and explanation

We take some distilled water in a dry rubber cap and check the conductivity of electricity with the help of the tester that we have used in activity 14.2.

The bulb of the tester does not glow when the tester is put in distilled water.

Now we add a pinch of salt in distilled water and check it with the tester, this time the bulb of the tester glows.

Why does distilled water not conduct electricity?

Because distilled water does not have free ions so it does not conduct electricity.

When we add some salt (NaCl)to the distilled water.

Sodium chloride dissociates into Na⁺ and Cl^- ions, that’s why the water conducts electricity.

 Conclusion

This activity shows that distilled water does not conduct electricity.

Related Topics

1. Activity 14.3

2. Activity 14.5