What is the optimal concentration of ethanoic acid for maximum foam production?

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Discussion Overview

The discussion centers around an experiment investigating the optimal concentration of ethanoic acid for maximum foam production when reacted with baking soda. Participants explore the relationship between acid concentration and foam height, considering the implications of limiting and excess reagents.

Discussion Character

  • Experimental/applied, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant describes an experiment where varying concentrations of ethanoic acid were tested with baking soda, noting a peak in foam production followed by a decline.
  • Another participant suggests that the observed foam height relates to the concept of limiting and excess reagents, questioning whether the same quantity of sodium bicarbonate was used throughout the trials.
  • A confirmation is provided that the same quantity of sodium bicarbonate was indeed used, which some participants argue supports the observed results.
  • There is a request for an explanation of why foam production decreases at higher concentrations of acid, despite the constant amount of bicarbonate being used as a limiting reactant.
  • A participant expresses confusion about the results, questioning why foam production would decrease even with excess acid present.

Areas of Agreement / Disagreement

Participants generally agree that there is an optimal concentration of ethanoic acid for foam production, but there is disagreement and uncertainty regarding the underlying reasons for the observed decrease in foam at higher concentrations.

Contextual Notes

The discussion does not resolve the reasons behind the decrease in foam production at high concentrations of acid, and assumptions regarding the chemical interactions and the role of limiting reagents remain unexamined.

prasannapakkiam
An experiment was carried out in class. Basically, Baking Soda was added to different concentrations of Ethanoic Acid. The plot of 'Maximum Foam observed' vs. 'concentration of the Acid'. The curve went up but then dropped noticeably! :confused:

So basically, with high concentrations or low concentrations; the foam created was low. it was as if there was an optimal concentration?

Note that this experiment was very fair. So Error? or something else?
 
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prasannapakkiam said:
An experiment was carried out in class. Basically, Baking Soda was added to different concentrations of Ethanoic Acid. The plot of 'Maximum Foam observed' vs. 'concentration of the Acid'. The curve went up but then dropped noticeably! :confused:

So basically, with high concentrations or low concentrations; the foam created was low. it was as if there was an optimal concentration?

Note that this experiment was very fair. So Error? or something else?
Your description suggests the concept of limiting and excess reagent. Did the experiment use always the same quantity of sodium bicarbonate?
 
yes it did.
 
symbolipoint:
Did the experiment use always the same quantity of sodium bicarbonate?
prasannapakkiam:
yes it did.
What you observed about the foam height is a logical result.
 
I would love if you would please explain why? :smile::smile::smile:
 
prasannapakkiam said:
I would love if you would please explain why? :smile::smile::smile:

The bubbling comes from the decomposing -bicarbonate; a constant amount of bicarbonate was used in every trial, keeping it as a limiting reactant when the acetic (ethanoic) acid was used in excess.
 
Sorry, But I am still not sure. Even if I put acid to excess, shouldn't the foam still rise to the same maximal level. However, it went down.
 

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