PH of a Solution

  • Thread starter ThatDude
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  • #1
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Homework Statement


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?
 

Answers and Replies

  • #2
epenguin
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Homework Statement


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?

You might have misread the question: acid is not being added.
 
  • #3
Borek
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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.
 
  • #4
epenguin
Homework Helper
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I think you are slightly missing it. :oldwink:
 
  • #5
Borek
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Geez, got it. What a brain fart o0)
 

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