Is Atomic Size the Key Factor in Determining Acidity Levels?

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SUMMARY

The discussion centers on the relationship between atomic size and acidity levels in acids, specifically comparing HX and HZ. It concludes that despite smaller atomic size leading to higher charge density, larger anions, such as those in HCl, HBr, and HI, result in greater stability of the conjugate base, thus enhancing acidity. The consensus is that HZ, with a larger atomic size, is indeed more acidic than HX due to the stability of its conjugate base.

PREREQUISITES
  • Understanding of acid-base theory
  • Knowledge of conjugate bases and their stability
  • Familiarity with electronegativity concepts
  • Basic grasp of molecular structure and atomic size
NEXT STEPS
  • Research the stability of conjugate bases in different acids
  • Explore the concept of charge density in relation to acidity
  • Study the acidity trends in the halogen acids HF, HCl, HBr, and HI
  • Investigate the role of atomic size in chemical reactivity
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Chemistry students, educators, and researchers interested in acid-base chemistry and the factors influencing acidity levels in various compounds.

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Suppose I have two acids HX and HZ. Say X is smaller then Z in atomic size. So then one would think that HX would be a more stable molecule then HZ since X has a higher charge density then Z (Both have same electronegativity) . HZ being a weaker molecule would dissociate more rapidly. Now my TA says that due to this HZ is more acidic then HX. Is this correct?
 
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Pretty much. Compare the acidity of HF, HCl, HBr and HI.
 
Correct. Acidity is a related to the stability of the conjugate base. A larger anion is more stable on its own than a small one, so the equilibrium favors the dissociated H+ and Z-.
 

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