The pH of a 0.0200 M solution of an unknown acid is 2.56. What is the Ka of this acid?To solve this problem:Write the acid dissociation equilibrium for the generic acid “HA”Set up an ICE chart ( with x = the concentration of H3O+ at equilibrium)Write the expression for Ka. Fill this in with the concentrations of H3O+, A- and HA at equilibrium, in terms of x.What is x? Can you find it from the given information? You should be able to use the pH to get the concentration of H3O+, which is x. Do this. Now that you know x, plug in into the Ka expression and find Ka.

Weak acid does not dissociate completely HA(s) + H2O(l) ⇔ H3O + (aq) +…

Answered: The pH of a 0.0200 M solution of an…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter14: Acids And Bases

Section: Chapter Questions

Problem 112QRT

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The pH of a 0.0200 M solution of an unknown acid is 2.56. What is the Ka of this acid?

To solve this problem:

Write the acid dissociation equilibrium for the generic acid “HA”
Set up an ICE chart ( with x = the concentration of H₃O⁺ at equilibrium)
Write the expression for Ka.
Fill this in with the concentrations of H₃O⁺, A^- and HA at equilibrium, in terms of x.
What is x? Can you find it from the given information? You should be able to use the pH to get the concentration of H₃O⁺, which is x. Do this.
Now that you know x, plug in into the Ka expression and find Ka.

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