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posted by  stauren on 4/5/2007 7:30:39 PM  |  status: Live  

aqueous solution

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Question Details:
In an aqueous solution of pH 7 the:

a. hydrogen ion concentration is zero

b. hydroxide ion concentration is zero

c. hydrogen and hydroxide ion concentrations are the same.

d. hydrogen ion concentration exeeds the hydroxide ion concentration

I think the answer is c because pH is neutral.  Is that right?

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posted by Mark on 4/5/2007 10:11:20 PM  |  status: Live
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stauren's comment:
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Response Details:
Yea, you are right it's C. The pH is pretty much a scale of the hydrogen and hydroxide ions. pH 7 is neutral so you have the same. As the pH lowers hydrogen ions have a higher concentration and if the pH raises the hydroxide ions have a higher concentration.
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posted by Jfcap on 4/6/2007 12:07:31 AM  |  status: Live
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stauren's comment:
"Thank you!"
Response Details:
C is correct.

pH of 7, means a pOH of 7 as well, because pH + pOH = 14.

To convert from pH (or pOH) to [H] or [OH], use the following formula.

[H] = 10-pH
[H] = 10-7 = 1.0 x 10-7

[OH] = 10-pOH
[OH] = 10-7 = 1.0 x 10-7

Hope that helps!
 
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