Higher Chemical Concentration = Higher Temperature of Precipitation. Why?

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Discussion Overview

The discussion revolves around the relationship between the concentration of chemical solutions and the temperature at which precipitation occurs. Participants explore how varying concentrations of reactants affect solubility and precipitation temperature, focusing on the chemical reaction between sodium sulfate and calcium chloride.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions why higher concentrations of mixed chemicals lead to precipitation at higher temperatures.
  • Another participant suggests considering how solubility changes with temperature, implying that higher temperatures allow more solute to dissolve.
  • A later reply states that as temperature increases, the solubility of the products increases, but solubility decreases with increased concentration, leading to higher precipitation likelihood at higher concentrations.
  • One participant expresses confusion and requests a clearer explanation of the concepts discussed.
  • A follow-up question asks whether increasing concentration results in increased solubility and if this subsequently lowers the temperature at which precipitation occurs.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the relationship between concentration, solubility, and precipitation temperature, with some points of confusion and differing interpretations present.

Contextual Notes

There are limitations in the discussion regarding assumptions about solubility and precipitation dynamics, as well as the specific conditions under which these relationships hold true.

soggybread
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If two chemicals are mixed together, say: Na_2SO_4 + CaCl_2 --> 2NaCl + CaSO_4

If I had varying concentrations of the reactant solutions, why is it that the higher concentration mixtures will precipitate at a higher temperature? and lower concentration chemicals will precipitate at a lower temperature?
 
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Think about how solubility is affected with a change in temperature.
In what situation (higher or lower temperature) will more solute (NaCl and CaSO4) dissolve in the water?
 
what?

Can u explain more clearly
 
As temperature increases solublity of both products increases. But solublity decreases when concentration is increased. At any temperature it is more likely that higher concentration will yield higher precipitation.
 
Thx

So by increasing concentration we are increasing the solubility. By increasing solubility we are lowering the temperature at which the precipitation occurs?

Do you know any website that has the theory behind this?

thx for the reply
 

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