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Posted by U15194380 (U15194380) on Thursday, 30th May 2013
For question 14(b) in the extended answer section, how do you explain part (ii)?
Posted by MissChemTeacher_Bitesize (U15172316) on Thursday, 30th May 2013
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.
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