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2009 higher paper

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  • Message 1. 

    Posted by U15194380 (U15194380) on Thursday, 30th May 2013

    Hi,

    For question 14(b) in the extended answer section, how do you explain part (ii)?

    Thanks

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  • Message 2

    , in reply to message 1.

    Posted by MissChemTeacher_Bitesize (U15172316) on Thursday, 30th May 2013

    Hi There!

    You have to use the table above the question to relate this to what is actually being asked.

    ethanoic acid - pH 2.3 (contains no chlorine atoms)
    chloroethanoic acid - pH 1.4 (contains one chlorine atom)
    dichloroethanoic acid - pH 1.0 (contains two chlorine atoms)
    trichloroethanoic acid - pH 0.2 (contains three chlorine atoms)

    So the more chlorine atoms in your acid, the more concentrated it appears to be - lower pH.

    This suggests that the acids with more chlorine atoms are able to dissociate more easily.

    I hope this helps with your understanding of the question.

    Cheers

    Miss_Chem smiley - cool

    Report message2

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