Put about 2 cm³ of Concentrated sulphuric (VI) acid into three separate boiling tubes. Place a thin moist/damp/wet filter paper dipped in acidified potassium dichromate (VI)solution...

Put about 2 cm³ of Concentrated sulphuric (VI) acid into three separate boiling tubes. Place a thin moist/damp/wet filter paper dipped in acidified potassium dichromate (VI)solution on the mouth of the boiling tube. Put about 0.5g of Copper turnings, Zinc granule and Iron filings to each boiling tube separately. State and explain the observations made.

Answers

1. Observation;
-Effervescence/fizzing/bubbles
-Blue solution formed with copper,
-Green solution formed with Iron
-Colourless solution formed with Zinc
-Colourless gas produced that has a pungent irritating choking smell.
-Gas produced turn orange moist/damp/wet filter paper dipped in acidified potassium dichromate (VI)solution to green

2. Explanation
Concentrated sulphuric (VI) acid is strong oxidizing agent.
It oxidizes metals to metallic sulphate(VI) salts and itself reduced to sulphur(IV)oxide gas.
Sulphur (IV) oxide gas turn orange moist/damp/wet filter paper dipped in acidified potassium dichromate (VI)solution to green.
CuSO₄(aq) is a blue solution. ZnSO₄(aq) is a colourless solution. FeSO₄(aq) is a green solution.

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Wilfykil answered the question on February 19, 2019 at 07:57

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