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Topic: A 0.0100 mol/  (Read 2369 times)

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Offline Bjc51192

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A 0.0100 mol/
« on: June 04, 2011, 04:04:04 PM »
 A 0.0100 mol/L of which of the following substances is expected to have a pH much larger than 7.0 at T = 25.0C?
   a) KNO3 (salt of a strong acid and a strong base)
   b) NH4NO3 (salt of a strong acid and a weak base)
C   c) KNO2 (salt of a weak acid and a strong base)
   d) Both a and b
   e) None of the above
 
I dont understand why the answer is C can someone break it down for me?
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Offline Bert95

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Re: A 0.0100 mol/
« Reply #1 on: June 04, 2011, 05:09:56 PM »
Think about the ions present in this solution and their acid/base properties.
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Offline Vidya

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Re: A 0.0100 mol/
« Reply #2 on: June 05, 2011, 02:58:52 AM »
KNO2 is the salt of weak acid
NO2-  + H2O ------>  HNO2  + OH-
I hope now you can figure out the reason
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Offline Bjc51192

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Re: A 0.0100 mol/
« Reply #3 on: June 05, 2011, 04:09:14 PM »
Indeed, thank you. The answer was so simple -_- Basic = greater than 7
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