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    In spread 2.1.21 pg 153 heineman text book
    How does that worked exapmle show there are 20 times more hydrogencarbonate ions than carbonic acid?
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    Is bromothymol blue a suitable indicator for all titrations?
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    (Original post by CoffeeStinks)
    Is bromothymol blue a suitable indicator for all titrations?
    I think so
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    (Original post by Schoolio93)
    you mentioned half life twice! lol! could you please tell me the difference between equivalence point and end point? Equivalence point is the point where both the acid and base are found in same quantities, whereas end point is when you reach full neutralization? is this right?
    Half life twice?:confused: half cell and half life

    Defintions from the book
    Equivalence Point
    is the pont in a tiltration at which the volume of one solution has reacted exactly with the volume of the second solution.

    End point
    the point in a tiltration at which there are equal concentrations of the weak acid and conjugate base forms of the indicator
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    (Original post by sportycricketer)
    Le Chatelier's Principle? and are you making revision cards out of this?
    I made revisions cards on cards so i can't upload them on here, sorry
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    [QUOTE=Rogercbinboy;32166934]Re-quoting that, anybody know?]


    the three you need to know are
    methyl orange 3.7 red -> yellow
    phenolphthalein 9.3 colourless -> pink
    litmus 6.5 red -> blue
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    [QUOTE=Lucy23;32168032]
    (Original post by Rogercbinboy)
    Re-quoting that, anybody know?]


    the three you need to know are
    methyl orange 3.7 red -> yellow
    phenolphthalein 9.3 colourless -> pink
    litmus 6.5 red -> blue
    you don't need to know those lol
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    (Original post by hellosarah)
    If the enthalpy change of hydration is greater than the enthalpy change of lattice enthalpe, the salt is more likely to be soluble. Is that right?
    Wouldn't be possible.
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    (Original post by Lucy23)
    the three you need to know are
    methyl orange 3.7 red -> yellow
    phenolphthalein 9.3 colourless -> pink
    litmus 6.5 red -> blue
    We don't need to know those btw!
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    (Original post by Rogercbinboy)
    Re-quoting that, anybody know?

    Good luck people anyway, prep your tits off and you'll do fine.
    might as well learn the three phenylphythaline pink 8.2 - 10, bromothymol blue - 6-7.6 and methyl orange - 3 - 4.4,
    not really much extra to remember, and colour is relatively easy as the higher pH colour is in the name.
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    (Original post by haydyb123)
    Wouldn't be possible.
    surely hydration is always bigger than lattice
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    Link to specification anyone?
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    (Original post by CoventryCity)
    Link to specification anyone?
    http://www.ocr.org.uk/download/kd/oc...d_gce_spec.pdf

    pg 51
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    (Original post by yesioo)
    Right change of plan. Looks like after today's disaster I'm going to need to get a B at least in this paper. Although I thought it was on Friday :emo: 1 and a bit days to revise :facepalm:

    Also, does anyone have Januarys exam for this paper?
    Yep, I'm in exactly the same situation. Screwed up yesterday and now really need to get a B tomorrow. Good luck to you - think I'm going to need it!!!
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    (Original post by J DOT A)
    This exam is a beast. I'm not even going to lie, it's probably one of the hardest A level papers we will face. The Jan exam was on a different level. If you thought unit 4 was hard, this takes it to a new extreme... So prepare guys!
    :rant:
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    So for redox titration calculations will we be given the half or full equations or are we expected to remember them. Like the ones Manganese and Iron etc. and the thiosulfate ones?
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    (Original post by CoventryCity)
    So for redox titration calculations will we be given the half or full equations or are we expected to remember them. Like the ones Manganese and Iron etc. and the thiosulfate ones?
    I believe we have to learn those ones.

    Or at least the ox states/colours.
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    (Original post by waecskt)
    surely hydration is always bigger than lattice
    If you mean less exothermic than yes.
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    Do we need to know what common alloys are comprised of?
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    (Original post by DrDr)
    Do we need to know what common alloys are comprised of?
    nope
 
 
 
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