Why filter a Nearly Saturated Solution of Ca(OH)2

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Discussion Overview

The discussion revolves around the rationale for filtering a nearly saturated solution of calcium hydroxide (Ca(OH)2) in a laboratory setting. Participants explore the implications of filtering, what might be captured by the filter paper, and the expected outcomes of the process.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the necessity of filtering a nearly saturated solution, noting that filter paper is typically used to remove solids and expressing confusion about what would be captured.
  • Another participant suggests that filtering might be aimed at removing calcium carbonate to prevent its formation in the filtered solution.
  • Concerns are raised about the effectiveness of filter paper in separating dissolved substances, with a participant reiterating that filters generally block solids.
  • A later reply acknowledges the loss of some solution during filtering due to wetting the filter and proposes that the goal may be to eliminate any undissolved calcium hydroxide.

Areas of Agreement / Disagreement

Participants express differing views on the purpose of filtering the solution, with no consensus reached on the specific rationale or expected outcomes of the filtering process.

Contextual Notes

The discussion lacks clarity on the specific context of the laboratory procedure, which may influence the reasoning behind the filtering step. Assumptions about the nature of the solution and the role of the filter paper remain unresolved.

fporejfpoer
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From a lab I am about to do:

"Pour 25.0 mL of nearly saturated solution of Ca(OH)2 into filter paper"

I am wondering why I would need to filter the solution (what a filter paper would capture). Isn't filter paper just good for removing solids. It is not even expected that all solution will pass through, only 15-20 mL. Why?
 
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How are you expected to treat or handle the filtered solution? My guess is that you are filtering any calcium carbonate and want to take actions to prevent any calcium carbonate from forming in the filtered solution.
 
But why would filter paper separate out a dissolved substance? Don't filters just block solids or something?
 
fporejfpoer said:
But why would filter paper separate out a dissolved substance? Don't filters just block solids or something?

Yes, that'd normally be the point.

It's natural that you're going to loose some solution in the process of filtering. Wetting the filter.
It'd be easier to say what the exact purpose was if we knew the context. But my best guess on the information given is that since it's near-saturated you're trying to get rid of any eventual remaining undissolved calcium hydroxide.
 

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