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Topic: Solubilities problem  (Read 1897 times)

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Offline agiantgreenlump

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Solubilities problem
« on: October 13, 2012, 03:39:16 PM »
Chromium and cadmmium can be removed from waste water by treatment with sodium hydroxide. Show the reactions of Cr 3+(aq) and NaOH(aq) and Cd 2+(aq) with NaOH(aq)


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Offline Arkcon

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Re: Solubilities problem
« Reply #1 on: October 13, 2012, 03:51:53 PM »
OK, lets see your attempt.  You've been given a hint -- how will the NaOH remove an ion?  What is it about the ions that make them difficult to remove?  And what would fix that?
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Offline agiantgreenlump

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Re: Solubilities problem
« Reply #2 on: October 13, 2012, 04:03:49 PM »
Quote from: Arkcon on October 13, 2012, 03:51:53 PM
OK, lets see your attempt.  You've been given a hint -- how will the NaOH remove an ion?  What is it about the ions that make them difficult to remove?  And what would fix that?

The NaOH dissociates in solution. The OH should attack the Cr and make Cr(OH)3 and the Cd should make Cd(OH)2 while they both leave Na+ in solution? I am not sure what you mean by the ions and being difficult to remove.
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Offline Arkcon

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Re: Solubilities problem
« Reply #3 on: October 13, 2012, 04:29:23 PM »
Yes, that's correct.  Now, answer the question asked by drawing the reactions.
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Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.
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