A 0.500M solution of a weak acid, HX, has a ka=3.26x10^-5 a) What is the pH of this solution? b) What is the percent ionization? c) What would be the pH be in a solution containing the strong electrolyte, 0.2M AlX3
A 0.500M solution of a weak acid, HX, has a ka=3.26x10^-5
a) What is the pH of this solution?
b) What is the percent ionization?
c) What would be the pH be in a solution containing the strong electrolyte, 0.2M AlX3?
d) What is the percent ionization in part C?
e) Does the presence of a strong electrolyte with a common ion increase or decrease the pH?
A 0.500M solution of a weak acid, HX, has a ka=3.26x10^-5
a) What is the pH of this solution?
b) What is the percent ionization?
c) What would be the pH be in a solution containing the strong electrolyte, 0.2M AlX3?
d) What is the percent ionization in part C?
e) Does the presence of a strong electrolyte with a common ion increase or decrease the pH?
1 Answer
Explanation:
To find the pH we can set up an
The expression for
Because of the small value of
From an initial moles of
Now the solution contains
Now the
Again, because
Now the percentage ionisation becomes:
You can see that adding extra
This is an example of "The Common Ion Effect" which is a consequence of Le Chatelier's Principle.
Adding a large amount of