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PH of a Solution

  1. Apr 4, 2015 #1
    1. The problem statement, all variables and given/known data
    To which of the following would the addition of an
    equal volume of 0.60 M NaOH lead to a solution
    having a lower pH? (a) water, (b) 0.30 M HCl,
    (c) 0.70 M KOH, (d) 0.40 M NaNO3.

    2.The attempt at a solution
    t
    he correct answer is 0.70 M KOH, and they say that by adding more OH you are producing a left shift. Okay, that's cool.

    My answer is 0.30 M HCl, this is because adding a strong acid will increase H+ concentration, OH- concentration will go down, therefore pH will decrease. Why is this wrong?
     
  2. jcsd
  3. Apr 4, 2015 #2

    epenguin

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    Gold Member

    You might have misread the question: acid is not being added.
     
  4. Apr 4, 2015 #3

    Borek

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    Staff: Mentor

    Perhaps I am missing something, but I don't get the question - in each case after adding NaOH pH goes up, it never goes down, thus it can't be lower.
     
  5. Apr 4, 2015 #4

    epenguin

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    I think you are slightly missing it. :oldwink:
     
  6. Apr 4, 2015 #5

    Borek

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    Staff: Mentor

    Geez, got it. What a brain fart o0)
     
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