Essential Chemistry for IGCSE - Making And Identifying Salts (Section 5 - No. 27)
What is a main observation when sulfur dioxide gas is present?
Turns limewater cloudy
Turns blue litmus paper red
Turns acidified potassium manganate(VII) solution colorless
Makes a squeaky pop sound
Explanation
Sulfur dioxide changes the color of the acidified potassium manganate(VII) solution from purple to colorless.
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