Question
In the determination of sulphur dioxide by p-rosaniline method, the end product is
The correct answer is
p-rosaniline methyl sulfonic acid
Sulphur Dioxide Determination: p-Rosaniline Method Product
The p-rosaniline method is a common technique for determining the concentration of sulphur dioxide (SO₂) in air samples. This method relies on a chemical reaction between SO₂ and specific reagents.
Reaction Overview:
- Air containing SO₂ is bubbled through a solution containing p-rosaniline hydrochloride and formaldehyde.
- Sulphur dioxide reacts with formaldehyde and p-rosaniline.
- This reaction forms a specific colored product, which can then be measured spectrophotometrically.
End Product Identification:
The reaction between sulphur dioxide, formaldehyde, and p-rosaniline results in the formation of p-rosaniline methyl sulfonic acid. This specific compound is responsible for the color intensity measured in the determination.
Therefore, the end product in the determination of sulphur dioxide by the p-rosaniline method is p-rosaniline methyl sulfonic acid.
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