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c7ng3400
Joined: 15 Aug 2009
Posts: 1
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 Posted: Thu Aug 20, 2009 10:23 pm Post subject: Amount of Bi2+ ions |
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In the reaction Bi2S3 --> 2Bi3+ + 3S2- I would think the ratio of S ions to Bi ions would be 3:2. Instead the concentration of Bi is 10^-32M and S is 0.01M. In other words I thought the equation would be:
Ksp = (2x)^2(3*0.01)^3
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mcat_premed3832
Joined: 19 Oct 2006
Posts: 413
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| Posted: Wed Aug 26, 2009 9:15 am Post subject: Ksp, solubility |
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What you did is a very common mistake in Ksp calculations. It all surrounds questions regarding concentration vs questions regarding solubility. The question asked for concentration but you used the calculation for solubility.
Concentration (square brackets):
Ksp = [Bi]^2 [S]^3
Solubility (using the variable s for solubility):
Ksp = (2s)^2(3s)^3 |
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RichardParker
Joined: 26 Nov 2010
Posts: 11
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| Posted: Sat Jan 01, 2011 3:41 pm Post subject: |
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| Wow, good question!! I made the same mistake ^ |
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