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Questions and Answers
What is produced at the cathode during the electrolysis of water?
What is the ratio of hydrogen to oxygen by volume in the electrolysis of water?
What happens when a burning candle is brought near the mouth of the test tube containing hydrogen gas?
Which of the following is true about the decomposition reaction of molten sodium chloride?
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Which gas collected during the electrolysis of water makes a candle burn brightly?
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Which gas is collected at the anode during the electrolysis of water?
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What is the state of sodium chloride used in the electrolysis to obtain sodium metal?
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What are the products of the electrolysis of molten aluminium oxide?
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Which type of reaction describes the decomposition of water into hydrogen and oxygen?
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How many volumes of hydrogen gas are produced in the electrolysis of water compared to oxygen gas?
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Study Notes
Electrolysis of Water
- The electrolysis of water involves the decomposition of water into hydrogen and oxygen gases, with hydrogen gas collecting at the negative electrode (cathode) and oxygen gas collecting at the positive electrode (anode).
- The volume of hydrogen gas collected is double the volume of oxygen gas collected, indicating a 2:1 ratio of hydrogen to oxygen in water.
- Hydrogen gas burns with a popping sound, while oxygen gas makes things burn brightly.
- The formula of water is H2O, indicating that water is a compound made up of 2 parts of hydrogen and 1 part of oxygen by volume.
Other Electrolysis Reactions
Electrolysis of Molten Sodium Chloride
- Passing electric current through molten sodium chloride (common salt) decomposes it into sodium metal and chlorine gas.
- The reaction is written as: 2NaCl (l) -> 2Na (l) + Cl2 (g)
- This reaction is used to obtain sodium metal from sodium chloride.
Electrolysis of Molten Aluminium Oxide
- Passing electric current through molten aluminium oxide decomposes it into aluminium metal and oxygen gas.
- The reaction is written as: 2Al2O3 (l) -> 4Al (l) + 3O2 (g)
- This reaction is used to obtain aluminium metal from aluminium oxide.
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Description
Learn about the process of electrolysis of water, including the roles of the cathode and anode, and the formation of gas bubbles at the electrodes.
