Solubility: Finding Without Boiling Water

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    Solubility
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Discussion Overview

The discussion revolves around methods to determine the solubility of a substance in solution without boiling the water. Participants explore various techniques and considerations related to measuring solubility, particularly in the context of a specific substance, phosphorous acid (H3PO3).

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about methods to find solubility without boiling water, emphasizing safety concerns.
  • Another suggests using specific gravity measurements or refractive index as potential methods to determine solubility.
  • A participant clarifies that they are specifically interested in the solubility of phosphorous acid in water.
  • Another participant proposes gradually adding the substance to a fixed volume of water to achieve saturation as a method for determining solubility.
  • Concerns are raised about the dangers of isolating the substance due to its chemical properties and the risks associated with boiling the solution.
  • Later, a participant mentions that they received the product in pure form and are preparing for a project, indicating a shift in focus from the initial inquiry.
  • One participant suggests that acid-base titration could be a viable method for determining the concentration of phosphoric acid, although this is later corrected to refer to phosphorous acid.
  • Another participant expresses satisfaction with their project and the feedback received from their chemistry teacher.

Areas of Agreement / Disagreement

Participants express differing views on the best methods for determining solubility, with no consensus reached on a single approach. Some methods are proposed, but the discussion remains unresolved regarding the most effective technique without boiling.

Contextual Notes

Participants discuss the specific challenges associated with measuring solubility for phosphorous acid, including safety concerns and the nature of the substance in solution. There are references to different methods that may depend on the specific properties of the substance being studied.

Who May Find This Useful

This discussion may be of interest to students and educators in chemistry, particularly those exploring solubility and safe laboratory practices for handling reactive substances.

Char. Limit
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Is there any method to find the solubility of a substance in solution... without boiling the water out of the solution? In other words, can you find the solubility of a substance in solution while somehow keeping it in solution (far less dangerous)?
 
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By solubility, do you mean concentration?

For many common substances, you should be able to find curves that connect concentration and specific gravity. It is easy to measure specific gravity of the solution by the means of a hydrometer or a sensitive scale. Another method is to measure the refractive index, that works best for substances whose native refractive indices are substantially different from that of water.
 
No, I really do mean solubility in water, unfortunately.
 
What's wrong with taking a fixed volume of water and gradually adding the substance till you obtain a saturated solution?
 
The substance (H3PO3) is already in solution, and my chemistry teacher warned me that getting it to pure form could be dangerous, what with there being phosphorus and all.

So I have no pure form, and was warned that boiling the solution to get pure form could be dangerous.
 
I have good news!

The product arrived today, and contrary to what we thought, it was in pure form! My culminating project is being done tomorrow. Wish me luck!
 
Not phosphoric - phosphorous.

Everything went well!
 
Yep, sorry. Still - acid base titration was an easy way to go.
 
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  • #10
I'm just glad that my chemistry teacher pronounced my actual work good, and my big problem... is explaining things...
 

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