Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    16
    ReputationRep:
    Name:  IMAG2306_1.jpg
Views: 15
Size:  66.1 KB hi I don't get why on the this question , the diagram would include a pt electrode . Attachment 608288608292 why is the electrode not cobalt metal ? Is this because in the question , no info is given about the colbalt metal ? Thus a pt electrode is used instead or is it because we have want find the standard cell potential, so a pt electrode is used ?


    Thanks
    Attached Images
     
    • Thread Starter
    Offline

    16
    ReputationRep:
    Also I am a bit confused by the concentration of the co2+ and co3+ ions. It says 1M of both solutions, does it mean there are 2mol dm^-3 of solution in total ? I thought you can only have 1M...
    Offline

    17
    ReputationRep:
    You can't attach a crocodile clip to either Co2+ or Co3+

    You are trying to find the voltage when one of the half cells is Co3+ + e- <-> Co2+ NOT Co2+ + 2e- <-> Co or Co3+ + 3e- <-> Co

    You have to have the solutions under standard conditions, which is defined as 1 mol dm-3 for each solution. The Co solution must have Co2+ at 1 mol dm-3 AND Co3+ at 1 mol dm-3. That is not 2 mol dm-3.

    (actually, as long as both Co2+ and Co3+ are the same conc it would give the same value as both at 1 mol dm-3)
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What newspaper do you read/prefer?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.