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Topic: Buffer question  (Read 3688 times)

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Offline narutodemonkill

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Buffer question
« on: April 11, 2010, 12:03:08 AM »
Which solution would most likely produce a buffer with a ph near 5? Question gave a list of mixtures
 the answer was B C5H5N(base) and C5H3NHI(acid)

the reason why I ignored this initially was because I thought a buffer was only formed by the addition of a weak acid and its conjugate base.

These two do not look like conjugates of each other...
can someone explain why this is the answer.
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Offline Borek

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Re: Buffer question
« Reply #1 on: April 11, 2010, 04:26:32 AM »
Yes they are.

What is Bronsted definition of an acid?

What is Bronsted definition of base?

Note that C5H3NHI is in fact ionic salt, that dissociates to C5H3NH+ and I-.
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Offline narutodemonkill

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Re: Buffer question
« Reply #2 on: April 11, 2010, 08:49:24 AM »
Quote from: Borek on April 11, 2010, 04:26:32 AM
Yes they are.

What is Bronsted definition of an acid?

What is Bronsted definition of base?

Note that C5H3NHI is in fact ionic salt, that dissociates to C5H3NH+ and I-.
Yes I know that..  but when C5H3NH^+ donates a hydrogen it becomes C5H3N and not C5H5N. And when C5H5N accepts it becomes C5H5NH^+.


This is the one question i got incorrect on my exam it is really bugging me.
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Offline Borek

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Re: Buffer question
« Reply #3 on: April 11, 2010, 03:57:01 PM »
Sorry, my mistake, I thought it is pyridine and pyridine hydroiodide.

Are you sure 3 was not a typo?
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Offline narutodemonkill

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Re: Buffer question
« Reply #4 on: April 11, 2010, 05:09:39 PM »
Quote from: Borek on April 11, 2010, 03:57:01 PM
Sorry, my mistake, I thought it is pyridine and pyridine hydroiodide.

Are you sure 3 was not a typo?

yes, so should I email my prof about this error?
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Offline Borek

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Re: Buffer question
« Reply #5 on: April 11, 2010, 06:53:07 PM »
If that was the reason you failed the question - sure.
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