Concept explainers
Using the equilibrium constants listed in Table 13.2, arrange the following 0.1 M aqueous solutions in order of increasing pH (from lowest to highest).
(a) NaNO2
(b) HCl
(c) NaF
(d) Zn(H2O)3(OH)(NO3)
Interpretation: The order of increasing pH value needs to be determined.
Concept Introduction: The dissociation reaction of a weak base is represented as follows:
The expression for the base dissociation constant will be as follows:
Here,
From hydroxide ion concentration, pOH of the solution can be calculated as follows:
From pOH, pH of the solution can be calculated as follows:
Answer to Problem 67QAP
0.1 M
Explanation of Solution
The given aqueous solutions are as follows:
M
Here, HCl is a strong acid thus, it completely dissociates in the solution.
From the table 13.2, the equilibrium constants for
(a)
The dissociation reaction of
The equilibrium constant can be calculated as follows:
Putting the values,
Thus,
Therefore, the value of
Thus,
The pOH of the solution can be calculated as follows:
Putting the values,
The pH of the solution can be calculated as follows:
Putting the values,
(b)
HCl is a strong acid, the dissociation can be represented as follows:
Since, molarity of HCl is 0.1 M thus, concentration of hydrogen ion is 0.1 M.
The pH of the solution can be calculated as follows:
Putting the value,
(c)
0.1 M
The dissociation reaction can be represented as follows:
The equilibrium constant for the reaction will be:
Putting the values,
Thus,
The value of x cannot be negative thus, it is equal to
Thus,
The pOH of the solution can be calculated as follows:
Putting the value,
The pH of the solution can be calculated as follows:
Putting the value,
(d)
0.1 M
The decomposition reaction can be represented as follows:
The equilibrium constant for the reaction will be:
Putting the values,
Thus,
Since, the value of x cannot be negative thus, it is equal to
Since,
The pH of the solution can be calculated as follows:
Putting the values,
The order of increasing pH value can be represented as follows:
0.1 M
Thus, the order of increasing pH value can be represented as follows:
0.1 M
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Chapter 13 Solutions
EBK CHEMISTRY: PRINCIPLES AND REACTIONS
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