
Concept explainers
(a)
Interpretation:
The solution that has the highest molarity is to be determined.
Concept introduction:
Molarity
The expression to calculate the molarity of solution when moles of solute and volume of solution are given is as follows:
(a)

Answer to Problem 4.12P
The solution in beaker B has the highest molarity.
Explanation of Solution
Consider the particles present in the beaker as moles of solute.
The formula to calculate the molarity of solution in beaker is as follows:
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Hence, the solution in beaker B has the highest molarity.
Molarity
(b)
Interpretation:
The solutions that have the same molarity are to be determined.
Concept introduction:
Molarity
The expression to calculate the molarity of solution when moles of solute and volume of solution are given is as follows:
(b)

Answer to Problem 4.12P
The solution in beaker A and F has the same molarity and solution in beaker C, D and E have the same molarity.
Explanation of Solution
Consider the particles present in the beaker as moles of solute.
The formula to calculate the molarity of solution in beaker is as follows:
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
The solution in beaker A and F has the same molarity and the value of molarity is
Molarity
(c)
Interpretation:
Whether the mixture of solution A and C have a higher, a lower, or the same molarity as solution B is to be determined.
Concept introduction:
Molarity
The expression to calculate the molarity of solution when moles of solute and volume of solution are given is as follows:
(c)

Answer to Problem 4.12P
The mixture of solution A and C has a lower molarity as compared to solution B.
Explanation of Solution
The number of moles in solution A is
The formula to calculate the total volume is as follows:
Substitute
Substitute
The mixture of solution A and C has lower molarity as compared to solution B.
Molarity
(d)
Interpretation:
Whether the molarity when
Concept introduction:
Molarity
The expression to calculate the molarity of solution when moles of solute and volume of solution are given is as follows:
(d)

Answer to Problem 4.12P
The molarity when
Explanation of Solution
The volume of solution D is
The volume of solution F is
Substitute
Substitute
The molarity of solution D is same as the molarity of solution F.
Molarity
(e)
Interpretation:
The solvent must be evaporated from solution E for it to have the same molarity as solution A is to be calculated.
Concept introduction:
Molarity
The expression to calculate the molarity of solution when moles of solute and volume of solution are given is as follows:
(e)

Answer to Problem 4.12P
Explanation of Solution
The molarity of solution E should be equal to solution A. Therefore the molarity os solution should be
The formula to calculate the molarity of solution in beaker is as follows:
Rearrange the equation (3) to calculate the volume of solution evaporated.
Substitute
Therefore to get the same molarity as of the solution A,
Molarity
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Chapter 4 Solutions
Chemistry: The Molecular Nature of Matter and Change
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