How to Calculate Hydronium Ion Concentration and pH in Acetic Acid Solution

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SUMMARY

The discussion focuses on calculating the hydronium ion concentration and pH of a 0.10 M acetic acid (CH3COOH) solution, utilizing its dissociation constant (Ka) of 1.75 x 10^-5. The hydronium ion concentration can be determined using the expression for Ka, which is defined as Ka = [H3O+][A-]/[HA]. By substituting the known values into this expression, the hydronium ion concentration and corresponding pH can be accurately calculated.

PREREQUISITES
  • Understanding of acid dissociation constants (Ka)
  • Basic knowledge of pH calculations
  • Familiarity with equilibrium expressions
  • Concept of weak acids and their ionization
NEXT STEPS
  • Learn how to derive the pH from hydronium ion concentration
  • Study the concept of weak acid equilibrium
  • Explore the impact of concentration on pH in weak acid solutions
  • Investigate the use of ICE tables in equilibrium calculations
USEFUL FOR

Chemistry students, educators, and anyone involved in acid-base chemistry or pH calculations will benefit from this discussion.

Fiza43
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a student prepared a 0.10 M solution of acetic acid, CH3COOH. acetic acid has a Ka of 1.75 * 10^-5. what are the hydronium ion concentration and the pH of the solution?

[hydronium ion] =
pH =
 
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Write out the expression for Ka and substitute what you know into the expression.
 

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