Concept explainers
Calculate the pH for each of the following solutions: (a) 0.10 M NH3, (b) 0.050 M C5H5N (pyridine).
(a)

Interpretation:
The pH for the given solutions has to be calculated
Concept Information:
Strong base and weak base:
Strong base dissociates into its constituent ions fully. It produces more of hydroxide ions while dissolved in water. Weak bases partially dissociates into its constituent ions.
According to Bronsted-Lowry, strong base is a good proton acceptor whereas weak base is a poor proton acceptor
Since, the ionization of a weak base is incomplete; it is treated in the same way as the ionization of a weak acid.
The ionization of a weak base
The equilibrium expression for the ionization of weak base
Where,
The
Relationship between
The relationship between the hydronium ion concentration and the hydroxide ion concentration is given by the equation,
As
To Calculate: The pH of the given solutions
To calculate the pH of 0.10 M
Answer to Problem 15.55QP
The pH of the given solution (a) is 11.11
Explanation of Solution
Record the given data
A 0.10-M solution of ammonia at
From the concentration and
Calculation of
The equilibrium table for ammonia can be constructed as follows,
Initial |
| ||
Change | |||
Equilibrium |
Therefore, the concentration of hydroxide ion is
Calculation of pOH:
The pOH can be calculated as follows,
Calculation of pH
The pH can be calculated using the following formula as follows,
Therefore, the pH of 0.10 M ammonia solution is 11.11
(b)

Interpretation:
The pH for the given solutions has to be calculated
Concept Information:
Strong base and weak base:
Strong base dissociates into its constituent ions fully. It produces more of hydroxide ions while dissolved in water. Weak bases partially dissociates into its constituent ions.
According to Bronsted-Lowry, strong base is a good proton acceptor whereas weak base is a poor proton acceptor
Since, the ionization of a weak base is incomplete; it is treated in the same way as the ionization of a weak acid.
The ionization of a weak base
The equilibrium expression for the ionization of weak base
Where,
The
Relationship between
The relationship between the hydronium ion concentration and the hydroxide ion concentration is given by the equation,
As
To Calculate: The pH of the given solutions
To calculate the pH of 0.050 M pyridine
Answer to Problem 15.55QP
The pH of the given solution (b) is 8.96
Explanation of Solution
Record the given datas
A 0.050 M pyridine at
From the concentration and
Calculation of
The equilibrium table for ammonia can be constructed as follows,
Initial |
| ||
Change | |||
Equilibrium |
Therefore, the concentration of hydroxide ion is
Calculation of pOH:
The pOH can be calculated as follows,
Calculation of pH
The pH can be calculated using the following formula as follows,
Therefore, the pH of 0.050 M pyridine solution is 10.48
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Chapter 15 Solutions
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