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    (Original post by Twinkles)
    Why does [Cu(H2O)6]2+ + HCl turn green first then yellow?
    I think it's green when the concentrations of the 2 complex ions are equal, an equal amount of blue + yellow = green
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    Do we need to know haber process, contact process etc???????
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    The June 10 paper wasn't too bad I though. But the January 11 one was on a whole other level, I found it infinitely more difficult...
    I'm hoping because its a June exam and most people are doing it for the first time it'll be easier, and to compensate for the massive ****-up they did in January for us...
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    (Original post by jontylol)
    The June 10 paper wasn't too bad I though. But the January 11 one was on a whole other level, I found it infinitely more difficult...
    I'm hoping because its a June exam and most people are doing it for the first time it'll be easier, and to compensate for the massive ****-up they did in January for us...
    Yes I know tell me about the january 2011 is so hard...do you mind helping me with a question in that paper...i posted it on the previous page. I'd be so grateful!! If not...it's fine..
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    (Original post by INeedToRevise)
    Do we need to know haber process, contact process etc???????
    Just the catalysts for each. Iron for Haber, and vanadium (V) oxide for contact.
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    (Original post by gregory14db)
    Just the catalysts for each. Iron for Haber, and vanadium (V) oxide for contact.
    Thanks
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    Tomorrow is not going to be a fun day at all
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    pH of 0.015mol of acid is 1.82.

    Nitric acid is diluted with equal volume of water.

    How do you work out pH of diluted acid?
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    I'm taking an early night and signing off - good luck people, lets hope OCR doesn't **** up again.
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    For kstab you dont add liquid in the equation but what about kc?
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    How do we know if a reaction will actually take place?

    how big does the standard electrod potential difference have to be?
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    (Original post by INeedToRevise)
    pH of 0.015mol of acid is 1.82.

    Nitric acid is diluted with equal volume of water.

    How do you work out pH of diluted acid?
    Since you are adding the same amount of water to the amount of nitric acid, the concentration of nitric acid halves. 0.015/2 = 0.0075

    So the new pH = -log[0.0075] = 2.12
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    (Original post by Pandit Bandit)
    How do we know if a reaction will actually take place?

    how big does the standard electrod potential difference have to be?
    differences have to be greater than 0.4V

    Can u help me


    pH of 0.015mol of acid is 1.82.

    Nitric acid is diluted with equal volume of water.

    How do you work out pH of diluted acid?
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    (Original post by Ayostunner)
    For kstab you dont add liquid in the equation but what about kc?
    Isn't that you dont add water??
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    What I want to see tomorrow:
    Essay question on Transition metal complexes and stereo isomerism.
    Long Electrode Potentials question
    Long rate equation question

    What i don't want to see tomorrow:
    Essay question on buffer solutions
    Long question on fuel cells
    Anything to do with hairdressing
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    (Original post by sportycricketer)
    Isn't that you dont add water??
    its water. hAving said that, the conversations we had previously best to double check.
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    (Original post by voices1)
    its water. hAving said that, the conversations we had previously best to double check.
    Can you expand on this?
    What don't we include into the Kstab equation?
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    (Original post by jontylol)
    What I want to see tomorrow:
    Essay question on Transition metal complexes and stereo isomerism.
    Long Electrode Potentials question
    Long rate equation question

    What i don't want to see tomorrow:
    Essay question on buffer solutions
    Long question on fuel cells
    Anything to do with hairdressing
    1. Buffers
    2. Transition Metals
    3. Rate Equation
    4. Born-Haber Cycle
    5. Electrode Potentials


    These are almost guaranteed to come up. They have tested Fuel Cells in both papers, I really hope they dont come up!
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    (Original post by Steven)
    Since you are adding the same amount of water to the amount of nitric acid, the concentration of nitric acid halves. 0.015/2 = 0.0075

    So the new pH = -log[0.0075] = 2.12
    Thanks. I always get confused with dilutions. It makes concentration smaller, i always forget.
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    (Original post by Pandit Bandit)
    How do we know if a reaction will actually take place?

    how big does the standard electrod potential difference have to be?
    the larger the diff between E-standard the more likely the reaction will take place however if the diff is less than 0.4V then the reaction is less likely to take place
 
 
 
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