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    Hi everyone,

    This is my first post so I hope it's in the right place.

    I have a question on the worksheet which states:
    "One suitable catalyst is Potassium Manganate (VII). Deduce the chemical formula of Potassium Manganate (VII)"

    I looked up the answer (oops) and the formula is KMnO4.

    So I assume that Potassium is +1 and Oxygen is -2, so where do I go from here? Could somebody explain how I would work out the correct answer?


    I think another issue i have with this is that I do not understand which part the roman numeral is referring to - is it the manganate ion alone or the compound as a whole?


    Sorry for my rambling and thanks in advance for your help!
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    (Original post by ella_v_)
    Hi everyone,

    This is my first post so I hope it's in the right place.

    I have a question on the worksheet which states:
    "One suitable catalyst is Potassium Manganate (VII). Deduce the chemical formula of Potassium Manganate (VII)"

    I looked up the answer (oops) and the formula is KMnO4.

    So I assume that Potassium is +1 and Oxygen is -2, so where do I go from here? Could somebody explain how I would work out the correct answer?


    I think another issue i have with this is that I do not understand which part the roman numeral is referring to - is it the manganate ion alone or the compound as a whole?


    Sorry for my rambling and thanks in advance for your help!
    It is common to write like,

    the oxidation state of Mn in KMnO4 is +7

    OR

    Mn(+7) in KMnO4

    OR

    potassium manganate(VII)

    the roman numeral is common in word names.

    My personal favourite is the second one rather than the wordy first one.

    It would seem that your problem is with the general thumb rules of oxidation state. It would do you best to read through and familiarise yourself with these.
    http://www.chemguide.co.uk/inorganic...idnstates.html

    In general, oxidation state has a definition of "the charge the atom would carry IF it does form an ion"
 
 
 
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