In this post, you will find NCERT Class 10 Science Activity 2.10 Explanation in detail. This activity is based on Chapter 2 Acids, Bases, and Salts of Class 10 Science.
NCERT Class 10 Science Activity 2.10 Explanation
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| Class 10 Science Activity 2.10 Explanation |
Activity- Take 10 ml of water in a beaker.
· Add a few drops of concentrated H2SO4 to it and swirl the beaker slowly.
· Touch the base of the beaker.
· Is there a temperature change?
· Is this an exothermic or endothermic process?
· Repeat the above activity with sodium hydroxide pellets and record your observations.
Observation
The temperature of the beaker rises in both cases.
Explanation
When an acid is added to water. It dissociates into ions like hydrogen ions [H+] and relevant anion.
`H_2SO_4 →2H^+ + SO4^-2`
The hydrogen ions in water react with water molecules to form hydronium ions.
`H^+ + H_2O→ H_3O^+`
So the formation of new bonds between hydrogen ions and water releases energy in the form of heat.
Conclusion
Dilution of H2SO4 and NaOH in water is an exothermic
process.
Precautions
1. Don't touch the acid.
2. Wear gloves on your hands.
3. Wear goggles.
4. Don't add water to acid.
Activity 2.10 Video
Activity 2.10 MCQ Quiz
Related Topics -
2. Activity 2.9
4. Extra Questions of Chapter 2
Frequently Asked Questions
1. What happens when an acid is added to water?
Ans- When an acid is added to water, an exothermic reaction takes place and the temperature rises.
2. How are hydronium ions formed?
Ans - Hydrogen ions combine with water molecules to form hydronium ions.
3. What type of reaction takes place when an acid is mixed with water?
Ans – An exothermic reaction takes place.
4. What is the chemical formula of sulphuric acid?
Ans – `H_2SO_4`
5. Write the reaction of dissociation of sulphuric acid?
Ans - `H_2SO_(4 ) →H^+ + SO_4^(-2)`
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