Question

when you add water to sulfir dioxide and put a blue litmus paper in it, why does it turn red?​

Answer 1

Answer:

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.

Explanation:

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Answer 2

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.

Hope it helps   =)