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  1. E

    chem doubt

    oct nov 2007 nmbr 3(a) i know this is stupid but i dont know how to do empirical formula questions.. :( can someone please explain step by step? Thx
  2. E

    Chem p33 - tips?

    Anyone with tips for the ion testing experiment? for example; a blue solution will most likely contain cu2+ ions.. Any other tips on other cations/anions?
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