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Testing for sulphur dioxide

Testing for sulphur dioxide

C028/4191

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

Testing for sulphur dioxide. Apparatus showing a positive test for sulphur dioxide (right). Test tubes containing dilute acidified potassium manganate (VII) solution (left) and potassium manganate (VII) solution that has been decoloured by sulphur dioxide gas (right). As sulphur dioxide de-colours potassium manganate (VII) solution, this reaction can be used as a test for the presence of sulphur dioxide.

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