Is There Missing Information in the Ksp Equilibria AgCl Data?

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Discussion Overview

The discussion revolves around the potential missing information in the Ksp equilibria data for AgCl, particularly concerning the volume of the initial solution. Participants explore implications for solving a limiting reagent question and the effects on precipitation.

Discussion Character

  • Debate/contested, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants express concern that the problem lacks crucial information, specifically the volume of the initial solution, which could significantly affect the outcome.
  • One participant suggests that the problem might assume no change in volume, indicating a possible simplification in the scenario.
  • Another participant mentions that the question is intended to be a limiting reagent problem, but acknowledges the incompleteness of the data provided.
  • It is noted that if the initial volume were as large as 2.4x106 L, there would be no precipitate, highlighting the importance of volume in determining the precipitation outcome.
  • One participant reports arriving at a different answer (B) and expresses uncertainty about their calculations, indicating variability in interpretations or approaches to the problem.

Areas of Agreement / Disagreement

Participants generally agree that there is missing information regarding the volume of the initial solution, but there is disagreement on how this affects the problem and the answers derived from it. Multiple competing views remain regarding the assumptions that can be made.

Contextual Notes

Limitations include the unspecified volume of the initial solution and the assumptions regarding changes in volume during the reaction, which may affect the interpretation of Ksp values and precipitation outcomes.

yolo123
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Please look at attached picture.

So, I tried solving it. Apparently, the answer is C. But, I think there is missing information (ie the volume of the initial solution). Care to back me up on this?
 

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yolo123 said:
Please look at attached picture.

So, I tried solving it. Apparently, the answer is C. But, I think there is missing information (ie the volume of the initial solution). Care to back me up on this?
I back you up. Without knowing the volume of the solution, you could have these halogen ions dissolved in an ocean of solvent.

Chet
 
Maybe they meant to assume no change in volume.
 
Yellowflash: I tried it, but it gave me B) as an answer (2.58 g more precisely). I'm not sure I did all the steps correctly though.
 
It is intended to be a limiting reagent question, with Ksp values given only to help in determining the order of precipitation. But yes, it is incomplete. If the initial volume is 2.4x106 L there will be no precipitate at all. We are not talking about some absurd volumes, 2.4x106 L is almost exactly olympic-size pool.
 

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