state the observation and inference made by a student when he brings
(a) a wet blue Litmus Paper
(b)a wet red litmus paper in contact with gas liberated during thermal decomposition of ferrous sulphate
Answers
Answer: a) Blue litmus turns red
b) No change in red litmus
Explanation:
As SO2 & SO3 are the gas liberated. These are acidic oxides of sulphur. Hence it turns blue litmus red & no change in red litmus.
The observation and inference made by a student when he brings
(a) a wet blue Litmus Paper
(b)a wet red litmus paper in contact with gas liberated during thermal decomposition of ferrous sulphate
Explanation:
Chemical nature
Every chemical substance has certain chemical nature that is :
- Acidic
- Basic
- Neutral
Acid
It is substance which is sour .
Base
It is a substance which is bitter .
Neutral
It is neither acidic nor basic
To detect the nature we have indicators :
Litmus
Phenolpthalein
Methyl orange and many more
Effect of litmus on acid and bases
Acid ; Turns blue litmus red
Base : Turns red litmus blue
Neutral : No effect
When FeSO₄ -----------------> Fe₂O₃ + SO₂ + SO₃
(on heating )
Similarly ,
When wet blue litmus paper is brought near the gas liberated : It turns red , due to acidic nature of sulphur oxides .
When wet red litmus paper is brought near the gas liberated : It has no effect because they are acidic not alkaline .