How to Arrange Bases in Order of Their Tendency to Combine with Protons?

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Discussion Overview

The discussion revolves around arranging various bases (NH3, H2O, OH-, CH3COO-, Br-) in order of their tendency to combine with protons. The focus is on understanding the definitions of strong and weak bases, as well as the classification of these compounds based on their ionic or molecular nature.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant asks for help in arranging the bases according to their basicity and provides relevant equilibrium constants (Kb and Ka) for some of the compounds.
  • Another participant suggests that understanding the definitions of strong and weak bases is crucial and hints at separating ionic compounds from molecular compounds.
  • A participant expresses uncertainty about how the hint provided will aid in solving the problem but acknowledges that starting with definitions may be beneficial.
  • One participant classifies Br- and OH- as strong electrolytes and questions whether this classification places them at the same end of the basicity scale.
  • Another participant admits to making a mistake in their previous statement and suggests that their approach may not have been the best for addressing the problem.
  • A later reply reassures the participant that making mistakes is part of the learning process.

Areas of Agreement / Disagreement

Participants appear to have differing views on how to approach the classification of bases and the relevance of separating ionic from molecular compounds. There is no consensus on the arrangement of the bases or the best method to analyze their basicity.

Contextual Notes

Limitations in the discussion include a lack of clarity on the definitions of strong and weak bases, as well as the absence of specific pKa values for some compounds, which may affect the analysis.

Who May Find This Useful

This discussion may be useful for students learning about acid-base chemistry, particularly those interested in the classification of bases and their tendencies to accept protons.

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Help with chemistry question?

Arrange the following bases in order of their tendency to combine with protons, putting the strongest base first:
NH3, H2O, OH-, CH3COO- (acetate ion), Br-.
NH3 Kb = 1.8 X 10-5
CH3COOH Ka = 1.8 X 10-5
 
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First of all, do you know the definition of strong bases vs. weak bases? Hint: separate the ionic compounds from the molecular compounds, and go from there.
 


I am not sure how this hint is going to work. But starting with definition will definitely help.

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I meant that strong bases are strong electrolytes, so separating them into ionic and molecular will give two groups, one of strong bases and one of weak. For me, it's easier to break things down into subgroups like this. Also, this is the best advice I could think to give, since pKa doesn't seem to be mentioned.
 


OK, I have classified both Br- and OH- as strong electolytes, does it mean they will be both on the same end of 'basicity' scale?

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methods
 


I see what you mean. My mistake. I'm still learning some of this myself, and I suppose what I said wasn't the best way to go about this problem. Sorry about that, disregard what I said before.
 


Don't worry, the only way to not make any mistakes is to not do anything

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methods
 

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