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    When your asked to write the conventional representation of a cell e.g. for the half-reaction Fe3+(aq) + e– → Fe2+(aq) where the other soloution is HCL at 1 moldm-3, Where does the ''Pt'' sign go in the equation. The answer is: Pt|H2|H+|Fe3+,Fe2+|Pt I dont understand why some questions 'Pt' is at the end of the conventional representation.

    Someone please help!?? Im so confused
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    (Original post by mjaay16)
    When your asked to write the conventional representation of a cell e.g. for the half-reaction Fe3+(aq) + e– → Fe2+(aq) where the other soloution is HCL at 1 moldm-3, Where does the ''Pt'' sign go in the equation. The answer is: Pt|H2|H+|Fe3+,Fe2+|Pt I dont understand why some questions 'Pt' is at the end of the conventional representation.

    Someone please help!?? Im so confused
    Hello


    Im guessing that the HCL half equation is the Standard Hydrogen Electrode. Pt represents the electrode(solid) and both of these half equations do not have a solid metal which can act as an electrode - so they both need the platinum electrode. Always put the electrode at the end of both half equations.

    The answer would be :

    Pt| H2 | H+ || Fe3+ , Fe2+| Pt . Are you sure the answer didn't include a salt bridge?


    But yeah, always put the electrode at the end.
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    (Original post by SubwayLover1)
    Hello


    Im guessing that the HCL half equation is the Standard Hydrogen Electrode. Pt represents the electrode(solid) and both of these half equations do not have a solid metal which can act as an electrode - so they both need the platinum electrode. Always put the electrode at the end of both half equations.

    The answer would be :

    Pt| H2 | H+ || Fe3+ , Fe2+| Pt . Are you sure the answer didn't include a salt bridge?


    But yeah, always put the electrode at the end.
    Thank you!! and yes sorry, there was meant to be a salt bridge in there! If one was a solid and one was in aqueous solution, where would the Pt go then?
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    (Original post by mjaay16)
    Thank you!! and yes sorry, there was meant to be a salt bridge in there! If one was a solid and one was in aqueous solution, where would the Pt go then?
    The Pt would go on the end of the half equation without any solid metal.

    Remember , the cell diagram is made from two different half equations - each half equation is in a different solution/beaker. So the Pt would only need to go with the beaker with no solid metal
 
 
 
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