
Concept explainers
(a)
Interpretation:
If a particle view of Mg (OH) 2 is drawn with 10 Mg2+ ions then the number of OH- required must be explained.
Concept Introduction :
Mg (OH) 2 is a base which undergoes dissociation to produce one Mg2+ and 2 OH-.
(a)

Answer to Problem 6E
20 OH- will be required.
Explanation of Solution
The dissociation of Mg (OH) 2 can be shown as
Thus, it is clear than the number of Mg2+ is half of OH- ions. So for 10 Mg2+ ions 20 OH- ions will be required.
(b)
Interpretation:
A particle view of Mg (OH) 2 must be drawn with 10 Mg2+ ions.
Concept Introduction :
Number of OH- will be doubled as compared to Mg2+ as 1 Mg (OH) 2 produces 1 Mg2+and 2 OH-.
(b)

Answer to Problem 6E
A sketch is shown below for Mg (OH) 2 with 10 Mg2+ ions.
Here, red dots represent Mg2+ and black dots represent OH-.
Explanation of Solution
From the sketch it is clear that number of OH- is double as compared to Mg2+.For 10 red dots (Mg2+) there are 20 black dots (OH-).
Chapter U4 Solutions
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