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Topic: How do I determine concentration of standard solution (ksp given)?  (Read 3234 times)

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Offline Kylash

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How do I determine concentration of standard solution (ksp given)?
« on: April 13, 2011, 04:43:10 PM »
What is the concentration of sulfide ions in a standard solution of FeS if 0.04 mol of Fe(NO3)2 is added 1.0 liters of the solution? Ksp of FeS is 8 * 10^-19.

What is the concentration of sulfate ion in a 1.0L solution of strontium sulfate to which .1 mol of Sr(CH3CO2)2 has been added? Ksp for SrSO4 is 3.2 * 10^-7.

There both kind of the same, so any assistance with EITHER of these would be greatly appreciated.
Thanks!
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Offline Borek

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Re: How do I determine concentration of standard solution (ksp given)?
« Reply #1 on: April 13, 2011, 05:18:50 PM »
In both cases there are two sources of cations - one is the added salt, other is dissolving solid. You can try to use ICE table, but it is not necessary. In both cases amount of dissolved solid is negligible compared with added solution.
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