Which Acid Has the Strongest Conjugate Base and Which is the Strongest Acid?

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Discussion Overview

The discussion revolves around identifying which Bronsted-Lowry acid has the strongest conjugate base and determining the strongest acid among a given set of acids. The scope includes theoretical considerations of acid strength and conjugate base relationships.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant asks which Bronsted-Lowry acid has the strongest conjugate base and which is the strongest acid among a list of acids.
  • Another participant suggests that the strength of an acid is related to the electronegativity of the element X in HX, noting an exception for fluorine.
  • A different participant argues that the size of X increases from F to I, leading to increased acidity from HF to HI due to decreasing H-X bond strength.
  • One participant asserts that HI is stronger than the other acids listed, based on their reasoning about bond strength and size.
  • Another participant agrees that the weakest acid corresponds to the strongest conjugate base, indicating that HF is the weakest acid.
  • One participant expresses uncertainty about their teacher's explanation regarding acid strength and plans to seek clarification.
  • Several participants confirm that HF is indeed the weakest acid, suggesting that the answer to the first question is correct.

Areas of Agreement / Disagreement

Participants express differing views on the strength of the acids and the relationship between acid strength and conjugate base strength. While some agree on HF being the weakest acid, there is no consensus on the strongest acid or the strongest conjugate base.

Contextual Notes

Participants reference various factors influencing acid strength, including electronegativity and bond strength, but do not resolve the complexities or exceptions involved in these relationships.

Who May Find This Useful

This discussion may be of interest to students studying acid-base chemistry, particularly those exploring Bronsted-Lowry theory and the factors influencing acid strength.

Soaring Crane
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1. Which Bronsted-Lowry acid has the strongest conjugate base?

a. HBr
b. HClO4
c. HF
d. HI

2. What is the strongest acid among the following?

a. HF
b. HCl
c. HBr
d. HI


Correct?
Thanks.
 
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Number two is incorrect. The higher the electronegativity of X in HX, the stronger the acid. However, an exception to this is fluorine, which is the point of the question. Following this, what do you think the answer is?
 
According to my text, the size of X increases from F to I, so acidity increases from HF to HI since the H-X bond strength decreases as you go down the group.

Therefore, shouldn't my answer be correct? HI is stronger than the other three?

If the elements of binary acids were in the same ROW, then increasing electronegativity indicates higher acid strength.
 
Last edited:
Soaring Crane said:
Therefore, shouldn't my answer be correct? HI is stronger than the other three?

Yes, you are right.

For the first one, you need to find the weakest acid (weaker the acid, stronger the conjugate base).
 
I apologize. My teacher must've made a mistake when he taught us that (he only mentioned it a few times in class). I will have to talk to him about that tomorrow.
 
Well, HF is the weakest acid, so my answer is correct for #1?
 
Yes, I think that's right as well.
 

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