Titration Questions Homework: Dry/Wet Flasks, Stoppering Flasks

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Discussion Overview

The discussion revolves around a homework problem related to the preparation and handling of saturated calcium hydroxide solutions during a titration experiment. Participants explore the implications of using dry versus wet flasks and the reasoning behind stoppering a flask in the context of preventing contamination and its potential effect on the solubility product constant (Ksp).

Discussion Character

  • Homework-related, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that only flask #1 could be wet since it contains the unfiltered solution.
  • Another participant questions the relevance of whether flasks are dry or wet without a stated purpose for each transfer.
  • A later reply clarifies that the overall purpose is to determine the Ksp of calcium hydroxide using titration calculations.
  • One participant emphasizes the importance of ensuring that the final solutions are exactly saturated, implying that this affects whether flasks need to be dry.
  • There is a question raised about the necessity of stoppering flask #2 and whether not stoppering it would affect Ksp.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of dry versus wet flasks and the implications of stoppering. The discussion remains unresolved regarding the specific purposes of individual transfers and their impact on the experiment.

Contextual Notes

Assumptions about the effects of wet versus dry flasks on the saturation of solutions and the role of stoppering in preventing contamination are not fully explored. The discussion lacks clarity on the specific conditions under which Ksp is measured.

Badgeray
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Homework Statement



A sample of saturated Ca(OH)2 solution in water is collected in flask #1, filtered into flask #2, then 25.00mL samples were transferred into flasks #3, #4, #5. Which flasks had to be dry and which could be wet?

Also, flask #2 was stoppered. Why?

Homework Equations

The Attempt at a Solution



I think only flask #1 could be wet since it is the only flask that has unfiltered solution.

I think flask #2 was stoppered since it was filtered to prevent contamination, but would it affect Ksp if it wasn't stoppered?
 
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With no purpose stated I cannot see how it matters whether any flask is dry or wet.

Stoppering the bottle is to stop it something getting to it, what could that be?
 
The purpose was to determine the Ksp of calcium hydroxide using titration calculations
 
That's the general purpose of the whole process, but you have not stated purposes of individual transfers - and that's what matters.
 
Well we now know it is needed to know for sure that the solutions he gets at the end are exactly saturated. Not difficult to see what needs to be dry IMO.
 

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