Question

Why does aluminium oxide dissolve in molten cryolite?

1 year ago

·

2 Replies

·

2332 views

C

Chester Gorczany


2 Replies

Duncan A Profile Picture
Duncan A Best Answer!

Verified Sherpa Tutor

Mixtures usually have lower melting points than pure substances so a mixture of cryolite and bauxite melts at a lower temperature than either pure substance. The electrolysis process is actually run at temperatures slightly below the melting point of pure cryolite. Nevertheless as bauxite is repeatedly added to the electrolysis cell it is fair to describe the process as aluminium oxide dissolving in molten cryolite. Both are ionic materials so will dissolve in each other as the ions will held together by electrostatic forces, just as in the pure materials.

Head of Chemistry. Examiner. Very experienced online tutor.

Interested in booking a 1-1 lesson with me?

Click here to view my profile and send me a message.
Carola Profile Picture
Carola Best Answer!

Verified Sherpa Tutor

Cryolite does not dissolve aluminium oxide, but lowers its melting point.

Experienced GCSE Science and A level Chemistry tutor with Phd

Interested in booking a 1-1 lesson with me?

Click here to view my profile and send me a message.

Got the answer? Help Chester out.

Back To Chemistry Back To Chemistry GCSE Back To Topic
Alert Icon

Need help with Chemistry?

We have thousands of qualified teachers who are able to provide top quality lessons online. Find your tutor and set up your free introduction today!

Find a Chemistry Tutor