Water, acidified with a small amount of dilute sulfuric acid, can be decomposed by electrolysis using the apparatus shown - Edexcel - GCSE Chemistry - Question 4 - 2015 - Paper 1
Question 4
Water, acidified with a small amount of dilute sulfuric acid, can be decomposed by electrolysis using the apparatus shown.
(i) State the form of energy used to carr... show full transcript
Worked Solution & Example Answer:Water, acidified with a small amount of dilute sulfuric acid, can be decomposed by electrolysis using the apparatus shown - Edexcel - GCSE Chemistry - Question 4 - 2015 - Paper 1
Step 1
State the form of energy used to carry out the electrolysis.
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Answer
The form of energy used to carry out the electrolysis is electrical energy. This energy is supplied by a direct current (d.c.) source, which allows the ions in the acidified water to migrate to the electrodes.
Step 2
Describe a test to show that this gas is hydrogen.
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To test for hydrogen, you can use a lit splint. Bring the lit splint close to the gas outlet where the hydrogen is being produced. If hydrogen is present, it will ignite with a 'pop' sound, confirming that the gas is hydrogen.
Step 3
Name a raw material that can be electrolysed to produce chlorine.
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A raw material that can be electrolysed to produce chlorine is sodium chloride solution, commonly known as brine.
