Cryolite, Na₃AlF₆, Is Used in the Electrolysis of Aluminum Oxide

question 36

Multiple Choice

Cryolite, Na₃AlF₆, is used in the electrolysis of aluminum oxide because

• A)it is a good source of fluoride ions.
• B)it reduces the energy requirement of the process, due to its low melting point.
• C)it provides a source of fluorine, an oxidizing agent.
• D)it provides a source of sodium, a reducing agent.
• E)it is very soluble in water.

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