We can observe the common-ion effect in action by comparing how much a pure sample of acid dissociates to how much a sample of an acid dissociates when its conjugate base is in solution. Let's consider the oxoacid HIO, which has a Ka of 2.3×10-11. part 1: Calculate the pH of an aqueous solution of 0.100 M HIO.  (Due to the low Ka value, you may apply the 5% approximation to avoid the quadratic equation if you wish.) part 2: Complete the RICE table for the dissociation of 0.100 M HIO in a solution with 0.0150 M IO- by selecting the correct answer from any dropdown boxes available.  (Remember that the conjugate bases are typically added in as a soluble salt, such as NaIO, but that the salt dissociates completely and the alkali metal cation is a spectator ion.) part 3: Calculate the pH for the solution made from  0.100 M HIO and 0.0150 M IO- .  For this case, you can also make the assumption that x will be negligibly small compared to the starting concentrations of the weak acid and conjugate base in order to simplify your calculations.

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 119QRT
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We can observe the common-ion effect in action by comparing how much a pure sample of acid dissociates to how much a sample of an acid dissociates when its conjugate base is in solution. Let's consider the oxoacid HIO, which has a Ka of 2.3×10-11.

part 1: Calculate the pH of an aqueous solution of 0.100 M HIO.  (Due to the low Ka value, you may apply the 5% approximation to avoid the quadratic equation if you wish.)

part 2: Complete the RICE table for the dissociation of 0.100 M HIO in a solution with 0.0150 M IO- by selecting the correct answer from any dropdown boxes available.  (Remember that the conjugate bases are typically added in as a soluble salt, such as NaIO, but that the salt dissociates completely and the alkali metal cation is a spectator ion.)

part 3: Calculate the pH for the solution made from  0.100 M HIO and 0.0150 M IO- .  For this case, you can also make the assumption that x will be negligibly small compared to the starting concentrations of the weak acid and conjugate base in order to simplify your calculations.  

 

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