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Topic: Did Dr. A make a mistake in this question?  (Read 2503 times)

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Offline SOS

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Did Dr. A make a mistake in this question?
« on: May 18, 2011, 08:15:00 PM »
http://answers.yahoo.com/question/index?qid=20080425230846AAasCXH


x = [OH-] =3.6 x 10^-6 M

pOH = 4.5

pH = 9.5

Shouldn't the -log3.6x10^-6 be 5.44 instead? Is he or I wrong in this?
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Offline Borek

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Re: Did Dr. A make a mistake in this question?
« Reply #1 on: May 19, 2011, 03:55:37 AM »
You are right. Probably a typo or something like that, correct answer is around 8.5
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Offline DrCMS

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Re: Did Dr. A make a mistake in this question?
« Reply #2 on: May 19, 2011, 04:03:00 AM »
Yes as Borek has said you're correct.

-log3.6x10-6 is 5.44

but
-log3.6x10-5 is 4.44

and
-log3.5x10-5 is 4.45
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