Na2SO4 ---> Na2S
I'm not sure how to get rid of the O4... I think I'm supposed to heat it to a really high temperature but I am not sure... Would anyone have the clues to remove the O4? I have searched online but all I get is ways to get Na2S in more complicated ways... I have already tried heating it for a few minutes at a high temperature and nothing happened... Should I let it get hotter?