
To:
Calculate the

Answer to Problem 22.59QA
Solution:
Explanation of Solution
1) Concept:
We are asked to find the pH of a solution of selenocysteine, which is a diprotic acid with two
2) Formula:
i)
ii)
3) Given:
i)
ii)
iii)
4) Calculations:
RICE table for selenocysteine
Reaction | ||||
[ |
[ |
|||
Initial | ||||
Change | ||||
Equilibrium |
Equilibrium constant expression for above reaction is
This equation fits the general form of a quadratic equation. Solving this equation to get values of x as
We will use the positive value of
We would use these equilibrium concentrations for
RICE table for selenocysteine [HA] for second dissociation:
Reaction | ||||
[ |
[ |
|||
Initial | ||||
Change | ||||
Equilibrium |
Equilibrium constant expression for the second dissociation for selenocysteine is
Solving this quadratic equation to get two roots as
We will consider only the positive value of
Thus,
Calculating pH using the formula
Conclusion:
For a diprotic acid, we need to consider the dissociation of two protons to find the pH of solution.
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Chapter 22 Solutions
Chemistry: An Atoms-Focused Approach (Second Edition)
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