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    (Original post by Itachi8)
    wat the indicator colour
    i got colourless to pink ... not 100% on the colourless
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    (Original post by TomSouthwell)
    What was uncertainty and how could you improve the experiment for the first question?
    they said they used a measuring cylinder so.. I said.. use a volumetric pipete
    uncertainty was the volume measured -0.05 and +0.05 I THINK
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    i said something stupid like transfer washings lol
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    (Original post by deeps21)
    i got colourless to pink ... not 100% on the colourless
    phenolphthalein is colourless in acid and neutral but pink in alkali
    I said pink to colourless I think.. XD
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    (Original post by deeps21)
    Flopped that, my mind went blank
    it said a measuring cylinder was used...so you should use a pipette



    what was the answer to the one about the electronegativity difference and ionic bonding?
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    (Original post by TomSouthwell)
    What was uncertainty and how could you improve the experiment for the first question?
    there were three Qs like that in the jan paper


    i just said use lower conc vinegar so the titre volume would be bigger and this would reduce the %error in the reading
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    (Original post by infernalcradle)
    it said a measuring cylinder was used...so you should use a pipette



    what was the answer to the one about the electronegativity difference and ionic bonding?

    the section A question?

    You had to find the largest difference in the numbers. I think it was choice b
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    (Original post by infernalcradle)
    it said a measuring cylinder was used...so you should use a pipette



    what was the answer to the one about the electronegativity difference and ionic bonding?
    options were
    a) 0.7 - 4
    b) 0.7 - 3.??
    c)
    d)

    I think a) had the largest difference so I did a)
    EDIT: I'm sure everyone got that right. all you had to do was find the largest difference by subtracting so let's not go theere
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    (Original post by deeps21)
    i said something stupid like transfer washings lol
    Thats what I said haha!
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    (Original post by Phalange)
    phenolphthalein is colourless in acid and neutral but pink in alkali
    I said pink to colourless I think.. XD
    the titration was acid to neutral so im thinking colourless to pink

    not too sure though
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    dammmm i wrote that,, but then crossed it out and wrote that if he diluted the sample more than a greater amount of the naoh.. Or something that was used to neutralize it wld be greater therefore percentage uncertainty is less...
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    (Original post by dull)
    the titration was acid to neutral so im thinking colourless to pink

    not too sure though
    neutral is colourless though
    if it was acid to neutral , it remains colourless

    I THINK they said they added to naoh? kind of vague..
    anyway it had to turn colourless as that is neutral and thats the point of titration
    it's nto a colour change from colourless to coolourless so I did pink to colourless
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    (Original post by Phalange)
    phenolphthalein is colourless in acid and neutral but pink in alkali
    I said pink to colourless I think.. XD

    No, its colourless in acidic... purple in alkali . End point is pink.

    And you were adding sodium hydroxide? (i think or some alkali)
    Therefore starting point was colourless
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    (Original post by Phalange)
    neutral is colourless though
    if it was acid to neutral , it remains colourless

    I THINK they said they added to naoh? kind of vague..
    anyway it had to turn colourless as that is neutral and thats the point of titration
    it's nto a colour change from colourless to coolourless so I did pink to colourless
    End point is pink ... End point meaning when it is neutral
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    in the edexcel book it says.. Red to colourless not pink.. I said red :s
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    (Original post by deeps21)
    No, its colourless in acidic... purple in alkali . End point is pink.

    And you were adding sodium hydroxide? (i think or some alkali)
    Therefore starting point was colourless
    :O Isn't the point of a titration to neutralise? naoh yes
    naoh is alkali so its pink?
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    (Original post by lpmad)
    in the edexcel book it says.. Red to colourless not pink.. I said red :s

    lookin at my george facer edexcel now... its defo pink
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    (Original post by Phalange)
    options were
    a) 0.7 - 4
    b) 0.7 - 3.??
    c)
    d)

    I think a) had the largest difference so I did a)
    EDIT: I'm sure everyone got that right. all you had to do was find the largest difference by subtracting so let's not go theere
    I think I did the largest difference, I'm not sure....don't think it was A though...

    the titration one....it was colourless to pink, no?
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    (Original post by Phalange)
    :O Isn't the point of a titration to neutralise? naoh yes
    naoh is alkali so its pink?
    Phenolphthalein : Acid = Colourless ..... Alkali = Purple ..... End point = Pink


    You start in acid (colourless) you add alkali to neutralise until end point (pink)
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    (Original post by infernalcradle)
    I think I did the largest difference, I'm not sure....don't think it was A though...

    the titration one....it was colourless to pink, no?

    yeh i got B not A
    yeh colourless to pink
 
 
 
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