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    Here's the paper I'm doing:
    http://qualifications.pearson.com/co...e_20130612.pdf

    I'm stuck on qquestion 3(d), the MS says the answer is B. However throughout my calculation I arrive at the conclusion that pKa = pH, so the answer I get is D.

    Am I missing something out in the question???

    Thanks
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    Hey! I just did that question and got D as well! Maybe ask your teacher about it tomorrow! Sometimes mark schemes can be wrong but i think D is definitely correct. This is because you are given twice the volume of the acid and equal concentrations of both acid and alkali, so yes, Ka = [H+].

    Sorry i couldnt tell you a definite answer, but I did get D aswell.

    Get back to me if you find out if D is right or is B right! Thank you
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    Are you looking at a different M/S to me? Mine says D is the correct answer.
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    :facepalm::facepalm::facepalm::facepalm:After a nice break, I realised I was looking at question 4(D) on the MS not 3(D), thanks guys lol
 
 
 
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