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Electrolysis and reduced mass of a metal bar

  1. Aug 18, 2014 #1
    1. Insert a bar of copper of m(gram) into (HCl + H2O). After a while, its weight become m_1 (gram) which is smaller than m. Explain why and give a general formula to find m_1



    2. None



    3. I keep thinking how that becomes possible, because I learn that Cu can't react with HCl+H2O
     
  2. jcsd
  3. Aug 18, 2014 #2

    Borek

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    Staff: Mentor

    Question states "electrolysis", you are thinking in terms of dissolution.
     
  4. Aug 18, 2014 #3
    my exercise is in Cu and Electrolysis chapter, I don't know how to explain why Cu's weight is lost over a short time.
     
    Last edited: Aug 18, 2014
  5. Aug 18, 2014 #4

    Borek

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    Staff: Mentor

    Then read the chapter, it explains what reactions take place on the electrode during electrolysis.
     
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