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Electrolysis and Electrolytes

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Question

Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.

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Solution

The chemical equation for the electrolysis of water is:
2H₂O(l)→2H₂(g)+O₂(g)
It is evident from the equation that water contains two parts of hydrogen and one part oxygen.
Therefore, during the electrolysis of water the amount of hydrogen gas collected in one of the test tubes is double than that of the oxygen produced and collected in the other test tube.
Hence, the name of the gas is Hydrogen.

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Q. Question 2

Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.

Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.

Q. In the electrolysis of water-(3 marks)
(i) Name the gas collected at the cathode and respectively.
(ii) Why is the volume of gas collected at one electrode double than that at the other
(iii) Given distinguishing tests for the gases evolued.

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