Concept explainers
3.62 What is the molarity of each ion present in aqueous solutions prepared by dissolving 20.00 g of the following compounds in water to make 4.50 L of solution?
(a) cobalt(III) chloride, (b) nickel(III) sulfate, (c) sodium permanganate, (d) iron(II) bromide
(a)
To determine: the molarity of cobalt (III) chloride solution.
Explanation of Solution
Molar mass of cobalt (III) chloride i.e.
Now, number of moles of
Thus, molarity of
Thus, 1 mole of
Hence,
Molarity of
Molarity of
(b)
To determine:
The molarity of nickel (III) sulfate solution.
Explanation:
Molar mass of nickel (III) sulfate i.e.
Now, number of moles of
Thus, molarity of
Thus, 1 mole of
Hence,
Molarity of
Molarity of
Explanation of Solution
Molar mass of nickel (III) sulfate i.e.
Now, number of moles of
Thus, molarity of
Thus, 1 mole of
Hence,
Molarity of
Molarity of
Therefore, knowing the number of moles of ionic solute for any volume of a given solution with its dissolution equation, the molarity could be calculated for the individual ion species formed in the solution.
(c)
To determine:
The molarity of sodium permanganate solution.
Explanation:
Molar mass of sodium permanganate i.e.
Now, number of moles of
Thus, molarity of
Thus, 1 mole of
Hence,
Molarity of
Explanation of Solution
To determine:
The molarity of sodium permanganate solution.
Molar mass of sodium permanganate i.e.
Now, number of moles of
Thus, molarity of
Thus, 1 mole of
Hence,
Molarity of
Therefore, knowing the number of moles of ionic solute for any volume of a given solution with its dissolution equation, the molarity could be calculated for the individual ion species formed in the solution.
(d)
To determine:
The molarity of iron(II) bromide solution.
Explanation of Solution
Molar mass of iron(II) bromide i.e.
Now, number of moles of
Thus, molarity of
Thus, 1 mole of
Hence,
Molarity of
Molarity of
Therefore, knowing the number of moles of ionic solute for any volume of a given solution with its dissolution equation, the molarity could be calculated for the individual ion species formed in the solution.
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