when do you add water to sulphur dioxide and put on a blue litmus paper why does it turn red
Answers
Answer:
Sulphur dioxide reacts to the addition of water, becoming acidic, that is an acid solution. It is then correctly names sulphuric acid. It will change the blue litmus paper to red, but if the litmus paper is red to begin with, the colour does not change.
Explanation:
Sulphur dioxide reacts with water to produce acidic product which turns blue litmus red.
The reaction of sulphur dioxide with water is -
SO2 + H20 --> H2SO3.
In the reaction, SO2 is sulphur dioxide, H2O is water, H2SO3 is sulfurous acid.
The resultant is sulphurous acid. It is a weak dibasic acid. It also acts as reducing agent.
Sulfurous acid is also part of acid rain. It reacts in atmosphere to form sulphuric acid. The reaction is -
2H2SO3 + O2 -> 2H2SO4.
In the reaction, O2 is oxygen and H2SO4 is sulphuric acid.