Concept explainers
8-41 What is the [OH-] and pOH of each solution?
(a) 0.10 M KOH,
(b) 0.10 M Na2CO3,
(c) 0.10 M Na3PO4,
(d) 0.10 M NaHCO3,
(a)
Interpretation:
The hydroxide ion concentration and pOH of KOH to be identified.
Concept Introduction:
Dissociation of water results in production of hydronium and hydroxide ion. The dissociation constant of water is denoted by Kw and can be represented as follows:
[H3 O+ ] [OH- ] = kw.
Where, kw is dissociation constant of water = 10-14.
[H3 O+ ] is the concentration of hydronium ion.
[OH- ] is the concentration of hydroxide ion.
Answer to Problem 29P
pOH of solution is 1.
Explanation of Solution
Hydronium ion concentration can be determined as:
Now, hydroxide ion concentration can be determined as:
pOH can be determined as:
Thus, pOH of solution is 1.
(b)
Interpretation:
The hydroxide ion concentration and pOH of Na2 CO3 to be identified.
Concept Introduction:
Dissociation of water results in production of hydronium and hydroxide ion. The dissociation constant of water is denoted by Kw and can be represented as follows:
[H3 O+ ] [OH- ] = kw.
Where, kw is dissociation constant of water = 10-14.
[H3 O+ ] is the concentration of hydronium ion.
[OH- ] is the concentration of hydroxide ion.
Answer to Problem 29P
pOH of solution is 2.4.
Explanation of Solution
Hydronium ion concentration can be determined as:
Now, hydroxide ion concentration can be determined as:
pOHcan be determined as:
Thus, pOH of solution is 2.4.
(c)
Interpretation:
The hydroxide ion concentration and pOH of Na3 PO4 to be identified.
Concept Introduction:
Dissociation of water results in production of hydronium and hydroxide ion. The dissociation constant of water is denoted by Kw and can be represented as follows:
[H3 O+ ] [OH- ] = kw.
Where, kw is dissociation constant of water = 10-14.
[H3 O+ ] is the concentration of hydronium ion.
[OH- ] is the concentration of hydroxide ion.
Answer to Problem 29P
pOH of solution is 2.0.
Explanation of Solution
Hydronium ion concentration can be determined as:
Now, hydroxide ion concentration can be determined as:
pOHcan be determined as:
Thus, pOH of solution is 2.0.
(d)
Interpretation:
The hydroxide ion concentration and pOH of NaHCO3 to be identified.
Concept Introduction:
Dissociation of water results in production of hydronium and hydroxide ion. The dissociation constant of water is denoted by Kw and can be represented as follows:
[H3 O+ ] [OH- ] = kw.
Where, kw is dissociation constant of water = 10-14.
[H3 O+ ] is the concentration of hydronium ion.
[OH- ] is the concentration of hydroxide ion.
Answer to Problem 29P
pOH of solution is 5.6.
Explanation of Solution
Hydronium ion concentration can be determined as:
Now, hydroxide ion concentration can be determined as:
pOH can be determined as:
Thus, pOH of solution is 5.6.
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