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    SlyPhoenix's Avatar
    SlyPhoenix Posts: 63, Reputation: 2
    Junior Member
    		  
    #1

    May 11, 2009, 09:25 AM
    oxidation numbers
    I need to assign an oxidation number to each of the elements in KMnO4

    K
    Mn
    O4



    I also need help with pH

    The pH of an acetic acid solution is 4.0. (10n = 1en).

    Calculate the [H+]. Moles/liter

    What is the [OH-]? Moles/liter
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #2

    May 11, 2009, 12:18 PM

    i need to assign an oxidation number to each of the elements in KMnO4

    K
    Mn
    O4
    Since there is no charge on KMnO4, the sum of oxidation states is 0

    Potassium has the oxidation state (OS) of +1
    Manganese has several OS, let's see that later.
    Oxygen has the oxidation state of -2

    Total OS (let x = OS of Manganese);

    1(+1) + x + 4(-2) = 0

    Solve for x to find the OS of Mn

    i also need help with pH

    The pH of an acetic acid solution is 4.0. (10n = 1en).

    Calculate the [H+]. Moles/liter

    What is the [OH-]? Moles/liter
    Use the formula;



    and to find the [OH-];



    Note: I've not done pH yet, for the second formula, I'm not so sure.
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