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Question:

What crucible is used to melt solid caustic soda?Why not quartz crucibles?

What crucible is used to melt solid caustic soda?Why not quartz crucibles?

Answer:

Do not use ceramic crucibles or quartz crucibles. Use metal crucibles, preferably with silver cruciblesThe quartz crucible reacts to form the sodium silicate (2NaOH+SiO2=Na2SiO3+H2O) ceramic crucible
Iron. React with ceramic or glass silica ash
A metal crucible can not be used with a porcelain crucible, because the reaction of caustic soda and silicate can not be used in ceramics

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