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Math Help - Redox Reactions

  1. #1
    Senior Member sakonpure6's Avatar
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    Redox Reactions

    Hi I have some redox reactions that I do not know how to do.

    1- 2 PbS + 3 O2 ----> 2 SO2 + 2 PbO

    2- 2 H2 + O2 -----> 2 H2O

    And I have one question, for H2 is it's charge +2 (because of the 2 , so 2*1) or +1?
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  2. #2
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    Re: Redox Reactions

    Yes, one Hydrogen ion (actually one proton) has charge +1 and so two have charge +2.

    That's good because that way "2 H2" has charge +4 while an Oxygen ion has charge -2 so that O2 has charge -4.
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  3. #3
    Senior Member sakonpure6's Avatar
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    Re: Redox Reactions

    can you please help me solve those two questions?
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  4. #4
    Senior Member Paze's Avatar
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    Re: Redox Reactions

    Quote Originally Posted by sakonpure6 View Post
    can you please help me solve those two questions?
    What do you need to know? You already "solved" them.
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  5. #5
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    Re: Redox Reactions

    I guess then, the question is, what do you mean by "solve them"? Show that they are valid? Start by showing that there are the same number of atoms of each element on the two sides.
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  6. #6
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    Re: Redox Reactions

    I assume by "solve", you mean find the net ionic equations. My suggestion for that would be the half-reaction method.

    This podcast that I used in school tells everything you need to know about redox reactions: https://docs.google.com/file/d/0Bw9U...ZvTmF0Mlk/edit

    Happy Studying.
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