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Topic: A basic problem  (Read 2800 times)

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Offline ptryon

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A basic problem
« on: September 12, 2011, 05:45:08 AM »
I read a question asking
"What will have a greater pH, a 1moldm-3 solution of Ba(OH)2 or a 1moldm-3 solution of ammonia?"

I am stuck with this one bacause barium hydroxide is only sparingly soluble (a couple of sources quote its Ksp as around 2 x 10-3), which would lead me to say that ammonia would have the higher pH. Can Barium hydroxide even form a 1moldm-3 solution at 298K?? Barium hydroxide is quoted has having a lower pKb than ammonia- suggesting it is a stronger base and would therefore form a solution with a higher pH than ammonia. Is this reasoning correct?

Any thoughts?

Offline Borek

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Re: A basic problem
« Reply #1 on: September 12, 2011, 08:37:03 AM »
You may need to do calculations to be sure about exact result, but you are on the right track. No way of making 1M barium hydroxide solution.
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Offline ptryon

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Re: A basic problem
« Reply #2 on: September 13, 2011, 01:59:27 AM »
Thanks for your thoughts Borek

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