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Topic: Molarity of Silver Ions?  (Read 2474 times)

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Offline Simons2

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Molarity of Silver Ions?
« on: October 29, 2016, 07:17:41 PM »
Estimate the molarity of silver ions in a mixture of AgBr and 10^-3 M KBr. Ksp(AgBr)=5x10^-13.

I originally got an answer of 7.1x10^-7 M by using x=Sqrt of Ksp: an equation given to me by my professor; which is not correct. I'm not sure where to go from here.
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Offline AWK

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Re: Molarity of Silver Ions?
« Reply #1 on: October 29, 2016, 07:22:46 PM »
Write down equation for Ksp of AgBr and look at your data - you know an approximate concentration of Br-.
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Offline Simons2

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Re: Molarity of Silver Ions?
« Reply #2 on: October 29, 2016, 07:31:20 PM »
Quote from: AWK on October 29, 2016, 07:22:46 PM
Write down equation for Ksp of AgBr and look at your data - you know an approximate concentration of Br-.

The second time I did this I used the 10^-3M along with the Ksp and got the answer of 5x10^-10M.
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Offline AWK

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Re: Molarity of Silver Ions?
« Reply #3 on: October 29, 2016, 07:49:13 PM »
And this reasult is a quite good approximation for Ag+ and solubility of AgBr in KBr solution.
More exact solution Ksp=[Ag+]ยท([Ag+]+[Br-]) with correction for ionic strength may be obtained iteratively tediously or by computer program instantly.
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