Ksp and precipitation of carbonates

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Discussion Overview

The discussion revolves around the solubility product constant (Ksp) and the precipitation of carbonates, specifically focusing on how to determine which carbonates will precipitate based on their Ksp values and ion concentrations. The context appears to be homework-related, with participants exploring the relationship between Ksp and solubility.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • One participant suggests that lower Ksp values indicate greater insolubility and initially selects strontium and barium carbonates based on this reasoning.
  • Another participant challenges the approach by suggesting that calculations should be performed instead of making assumptions.
  • A later reply indicates confusion about what calculations are necessary to determine precipitation.
  • Further responses clarify that given Ksp values and ion concentrations can be used to check if a precipitate will form, emphasizing the importance of considering dilution.
  • One participant concludes that after calculations, strontium and barium carbonates will not dissolve, suggesting that the answer is B.
  • A subsequent response confirms this conclusion.

Areas of Agreement / Disagreement

The discussion reflects a mix of initial confusion and clarification regarding the calculations needed to determine precipitation. While one participant arrives at a conclusion about the answer, there is no explicit consensus on the method or reasoning behind the calculations.

Contextual Notes

Participants express uncertainty about the necessary calculations and the implications of Ksp values, indicating a reliance on assumptions that may not be fully articulated. The discussion does not resolve the broader implications of Ksp in relation to different carbonates.

TT0
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Homework Statement


Screen Shot 2016-07-04 at 1.46.53 PM.png


Homework Equations

The Attempt at a Solution


The lower the Ksp, the more insoluble. Therefore, I chose B since strontium and barium carbonates have the lowest Ksp. However, the question asks which carbonate will precipitate and I know that all carbonates are insoluble. Can someone explain to me what did I think wrong?

Cheers!
 
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Why don't you calculate instead of guessing?
 
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Why don't you calculate instead of guessing?

Sorry, but I can't see what to calculate. Could you please tell me where can I calculate something?

Thanks!
 
You are given Ksp, you are given concentrations - you can easily check whether the precipitate should form or not. If you don't see how - read about solving Ksp related problems.

Don't forget about dilution.
 
I see, after calculating, strontium and barium carbonate won't dissolve as the molarity of the ions in the solution exceed the amount that will dissolve. Is the answer B?

Thanks
 
Yes.
 
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