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Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread watch

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    (Original post by samb1234)
    Yeah that is weird. For these kind of things its probably best to go by the user guide since thats the official edexcel version, even if it may be wrong
    The edexcel revision guide i have says that a green ppt that is formed which stays as a green ppt with excess NH3. No green solution?

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    (Original post by ayvaak)
    The edexcel revision guide i have says that a green ppt that is formed which stays as a green ppt with excess NH3. No green solution?

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    Lol this is the problem. Go by the user guide, but bear in mind that when I actually did the practicals half of these results are utter rubbish - maybe like 0.1% of our chromium thing redissolved if that
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    (Original post by samb1234)
    Lol this is the problem. Go by the user guide, but bear in mind that when I actually did the practicals half of these results are utter rubbish - maybe like 0.1% of our chromium thing redissolved if that
    probably a dumb question but whats the user guide you mentioned?
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    (Original post by ayvaak)
    probably a dumb question but whats the user guide you mentioned?
    http://www.thestudentroom.co.uk/atta...9&d=1463251722
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    I thought managanese(II) formed a brown precipitate following deprotonation >.>?
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    (Original post by Ayman!)
    Does it help if I tell you that ethanedioic acid is di-protic?
    I get that it's di-protic. But how does being di-protic affect the accuracy? I just don't get that part. :confused:
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    Thanks
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    Hey, can anyone explain to me when to put water into an equilibrium equation and when to leave it out?
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    Does anyone have a picture of the 3 titration graphs we need to know along with the values e.g. start pH, equivalence point, end pH, range of vertical section etc.?
    Thanks in advance, I REALLY need help with these!
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    (Original post by dj3k)
    Does anyone have a picture of the 3 titration graphs we need to know along with the values e.g. start pH, equivalence point, end pH, range of vertical section etc.?
    Thanks in advance, I REALLY need help with these!
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    (Original post by Don Pedro K.)
    ah okay gl
    quite a nice paper imo
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    Haha enjoyed the Jan 15 paper. Will mark after dinner
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    How many exams does everyone have left now? or are most people yet to start them like me
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    (Original post by samb1234)
    quite a nice paper imo
    (Original post by Ayman!)
    Haha enjoyed the Jan 15 paper. Will mark after dinner
    Haha yeah I did decent in it (78/90). you guys probably got high 80s or something but
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    (Original post by Don Pedro K.)
    Haha yeah I did decent in it (78/90). you guys probably got high 80s or something but
    nah i got 81 but in the exam i would have got 85 as i wouldn't have tried to do the ester Kc one in my head and thought it was 0.004 when doing parts and 0.04 in others haha
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    (Original post by samb1234)
    nah i got 81 but in the exam i would have got 85 as i wouldn't have tried to do the ester Kc one in my head and thought it was 0.004 when doing parts and 0.04 in others haha
    loool nice xD I messed up on the Kc one :/ But now I understand that the NaOH reacts with the ethanoic acid and HCl once equilibrium has been reached xD I'm not feeling too bad for unit 4 tbh. Unit 5 is alright too, but I've only been scraping As by one or two marks :/
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    (Original post by Don Pedro K.)
    loool nice xD I messed up on the Kc one :/ But now I understand that the NaOH reacts with the ethanoic acid and HCl once equilibrium has been reached xD I'm not feeling too bad for unit 4 tbh. Unit 5 is alright too, but I've only been scraping As by one or two marks :/
    I haven't done any unit 5 papers yet ill do some in the next few days. At least I have quite a big margin for error if a paper is filthy thankfully
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    (Original post by samb1234)
    I haven't done any unit 5 papers yet ill do some in the next few days. At least I have quite a big margin for error if a paper is filthy thankfully
    Haha yeah Good luck ^_^! I'm sure you'll do well lol
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    (Original post by Don Pedro K.)
    Haha yeah Good luck ^_^! I'm sure you'll do well lol
    And you, sounds like you are on the right track to do very well
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    (Original post by samb1234)
    And you, sounds like you are on the right track to do very well
    Thank you, I hope we'll both (and everyone else here of course also) succeed ^_^
 
 
 
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