Chemistry  permalink

2009 higher paper

This discussion has been closed.

Messages: 1 - 2 of 2
  • Message 1. 

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


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


    Report message1

  • 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.


    Miss_Chem smiley - cool

    Report message2

Back to top

About this Board

The Bitesize messageboards have now closed

or register to take part in a discussion.

The message board is currently closed for posting.

The boards are now closed

This messageboard is pre-moderated.

Find out more about this board's House Rules

Search this Board

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.