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Question
What flux would you use to remove the following impurity?
SiO2
Very Short Answer
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Solution
For SiO2 (silica impurity), the flux used is CaO (lime/quicklime).
\[\ce{CaO + SiO2 -> CaSiO3}\]
Thus, basic flux (CaO) is used to remove acidic impurity (SiO2) by forming fusible slag.
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