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Question
What flux would you use to remove the following impurity?
P2O5
Very Short Answer
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Solution
The impurity P2O5 is acidic in nature. To remove it, we use a basic flux, most commonly CaO (lime/quicklime).
\[\ce{3CaO + P2O5 -> Ca3(PO4)2}\]
So, the flux used to remove P2O5 is CaO.
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Chapter 6: General Principles and Processes of Isolation of Elements - REVIEW EXERCISES [Page 354]
