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    (Original post by BioStudentx)
    Oh ****. I did exactly that except I said Kw/10^-7 is H+ and not OH-. Oh dear haha.
    Easy mistake. Don't worry- think it was just like 1 or 2 marks. Everyone is going to make silly mistakes somewhere XD
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    In comparion to 2015. Harder or easier? Am I retarded to think the grade boundaries will be 75 for an A?
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    (Original post by BioStudentx)
    Oh ****. I did exactly that except I said Kw/10^-7 is H+ and not OH-. Oh dear haha.
    wanna know a worse mistake? I worked out [OH-] and [H+] then decided that 9.4x10^-7 was a smaller number than 10^-7......
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    (Original post by k.russell)
    you're right, CuI is insoluble in water dw
    I was doing it right at the end cos I was doing the ionic equation for the question above (which asked for some other full equation) and realised my mistake with about 10 seconds left lol
    What question is this?
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    (Original post by Slenderman)
    In comparion to 2015. Harder or easier? Am I retarded to think the grade boundaries will be 75 for an A?
    slightly harder, 85-A*, 77-A just what I think

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    Got 10.76 instead of 10.68 for one of the ph calculation... not sure where I went wrong tho...
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    (Original post by MrZebraCookie)
    What question is this?
    excess KI + copper (II) ions --> solid copper(I) iodide + iodide ion i think.
    the same experiment come up a couple years ago i think.
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    (Original post by BioStudentx)
    I was referring to the arguments occurring in the forum.

    But yes it was alkaline and I still don't understand why.
    Yeah I know sorry, I was just trolling
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    (Original post by lai812matthew)
    excess KI + copper (II) ions --> solid copper(I) iodide + iodide ion i think.
    the same experiment come up a couple years ago i think.
    I don't even remember this being asked. Do you know where it was in the paper?
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    (Original post by lolo11)
    Easy mistake. Don't worry- think it was just like 1 or 2 marks. Everyone is going to make silly mistakes somewhere XD
    (Original post by k.russell)
    wanna know a worse mistake? I worked out [OH-] and [H+] then decided that 9.4x10^-7 was a smaller number than 10^-7......
    Haha, upon reflection I lost 4 marks to stupid mistakes (and 2 marks I didn't genuinely know).

    Oh dear, this paper got a bit harder all of a sudden :laugh:

    Concentration levels are bound to drop during a pressurised 2 hour exam tbf.
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    (Original post by MrZebraCookie)
    I don't even remember this being asked. Do you know where it was in the paper?
    last question when they ask you ionic equation with state symbol
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    (Original post by BioStudentx)
    Haha, upon reflection I lost 4 marks to stupid mistakes (and 2 marks I didn't genuinely know).

    Oh dear, this paper got a bit harder all of a sudden :laugh:

    Concentration levels are bound to drop during a pressurised 2 hour exam tbf.
    Yeah I for sure dropped 1 mark on that [OH-] question, and another for the equation with Cu+ and I-, I reckon I may or may not have dropped one for the question about the rate equations so am hoping (fingers crossed) for around 93/4 as I'm sure there was a few more marks of bs I lost in there. Sounds like you might be in the same boat, hopefully we still hit dat 1 fiddy
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    (Original post by k.russell)
    Yeah I for sure dropped 1 mark on that [OH-] question, and another for the equation with Cu+ and I-, I reckon I may or may not have dropped one for the question about the rate equations so am hoping (fingers crossed) for around 93/4 as I'm sure there was a few more marks of bs I lost in there. Sounds like you might be in the same boat, hopefully we still hit dat 1 fiddy
    Doubt we'll hit 150. I'll probably have dropped more marks (not sure about you). There's always something
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    there are 2 ways to prove that pH=7 is alkali in 60 degree celsius. is a bit easier to see the picture by neutral pH calculation imo. Kw=[H+(aq)][OH-(aq)], so square root of Kw equal to [H+(aq)], and find the pH equals 6.52. anything above 6.52 is alkaline, vice versa. 7>6.52, so it is alkali.
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    Do u remember if the Au equation was 1 or 2 marks?
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    (Original post by BioStudentx)
    Doubt we'll hit 150. I'll probably have dropped more marks (not sure about you). There's always something
    hmm my coursework is poor so need a 95% ums average (there abouts) from the exams to get an A*. It's gonna be really really close as to whether I've done enough, a 150 would help me out so much
    deffo dropped 2 marks on both papers and I am sure there are more mistakes I can't remember. ****ing wish I had 40/40 coursework could've probs got that without too much sweat as well..
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    (Original post by MilkFriend)
    Got 10.76 instead of 10.68 for one of the ph calculation... not sure where I went wrong tho...
    Anyone got 10.76... no idea about what happened.
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    (Original post by BioStudentx)
    Haha, upon reflection I lost 4 marks to stupid mistakes (and 2 marks I didn't genuinely know).

    Oh dear, this paper got a bit harder all of a sudden :laugh:

    Concentration levels are bound to drop during a pressurised 2 hour exam tbf.
    dropped at least 7 marks, got cis and trans the wrong way round, charge of complex ion wrong way round (i written 2+), don't know that starch is used to give color change, don't know what is standard form, and the most idiotic mistake comes to......i written down that i am using redox system 5 and 6, but used redox system 6 and 7 and write equations and explain from it. !
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    (Original post by Slenderman)
    In comparion to 2015. Harder or easier? Am I retarded to think the grade boundaries will be 75 for an A?
    Not retarded but very optimistic my friend. I would say 80 = A
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    [H+]= square root of Kw at 60c
    [H+]= square root 9.313*10^-14
    [H+]= 3.05*10^-7
    -log 3.05*10^-7= 6.5
    Since 6.5<7 so pH 7 is alkaline
 
 
 
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