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    (Original post by mriffin)
    nope i got 1.2 something because 0.833 was for (acid)/(salt) but it wanted the reciprocal of that
    oh ffs i don't do maths
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    Grade boundaries?
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    (Original post by perpetua)
    Grade boundaries?
    73 for A ?

    i would add i know f all about the grade boundaries or last years ones
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    what did everyone get for the Mr of the abundant peak?
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    Join!!!
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    (Original post by Mary_7)
    oh ffs i don't do maths
    Yes, you have to rearrange the Henderson-Hasselbalch equation so you get:

    10^(pH-pka) = [A-]/[HA]

    I got 1.2 something.
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    (Original post by abzz11)
    what did everyone get for the Mr of the abundant peak?
    112. The ratio was 3:1 so I thought well 35Cl must be both if the atoms is it's the most abundant.
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    (Original post by Mriffin)
    Nope I got 1.2 something because 0.833 was for (acid)/(salt) but it wanted the reciprocal of that
    Yeah I got 1.208333 which rounded to 1.21
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    (Original post by jessyoung)
    I definitely saw the word dipeptide
    Me too,I am like 99% sure it was dipeptide!!
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    Is chromatography allowed??
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    I got around 1.2 aswell with a bit of rearranging and looking at similar fractions
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    Martin luther King had a dream, but then he took aqa chem4 2016 and his dreams went down the toilet
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    (Original post by emma_1111)
    Is chromatography allowed??
    Yes - there's not a lot else it could be I don't think?

    Since only one of the compounds was sufficiently polar, it would be attracted to the stationary phase.
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    (Original post by Cadherin)
    Yes - there's not a lot else it could be I don't think?

    Since only one of the compounds was sufficiently polar, it would be attracted to the stationary phase.
    Would filtration not be allowed? It's the other thing I could think of:/
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    (Original post by SirRaza97)
    112. The ratio was 3:1 so I thought well 35Cl must be both if the atoms is it's the most abundant.
    I think 112 and 114 will be allowed, as the probability of 35 : 35 is equal to that of 35 : 37.
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    (Original post by Cadherin)
    Yes - there's not a lot else it could be I don't think?

    Since only one of the compounds was sufficiently polar, it would be attracted to the stationary phase.
    I said you could heat and distill off the alcohol?
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    I don't know what all the fuss is about, there were some challenging applications but nothing we don't already know. Hoping for at least 90ish
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    (Original post by SubwayLover1)
    I said you could heat and distill off the alcohol?
    Isn't there a risk of hydrolysis?
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    (Original post by amsib)
    long story short 2016 is going to be the year with no vets, medics or dentists
    Thanks aqa:congrats:
    I had applied for veterinary and now I'm going to have to get an Ace chem 5 if I want to get in 😭😭
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    (Original post by DexterMabel)
    I had applied for veterinary and now I'm going to have to get an Ace chem 5 if I want to get in 😭😭
    Same so let's pray and cry together please😭
 
 
 
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