Question

Which is the most satisfactory solvent for alumina, Al 2O3, in the electrolytic process for the preparation of aluminum?

a) liquid water, H2O b) molten cryolite, Na 3AlF6 c) molten bauxite, Al2O3 with other oxides d) molten sodium chloride, NaCl

There is a video about it here: https://www.clutchprep.com/chemistry/practice-problems/12679/which-is-the-most-satisfactory-solvent-for-alumina-al-160-2o3-in-the-electrolyti?reflink=searchresults

But the "tutor" does not really provide an answer to WHY molten cryolite (Na3AlF6) is the one that is "strong enough" to melt Al2O3.


Comments
  • You are never going to be asked why that is the reason. It is just industrially efficient way to use Na3AlF6 as a solvent for Al2O3. you may read more information here. https://en.wikipedia.org/wiki/Cryolite Nika commented almost 3 years ago