Interpretation:
The solution with the highest molarity and highest density needs to be identified from 1.0 g KCl in 1.0 L water, 5.0 g KCl in 0.5 L water and 10.0 g KCl in 0.3 L.
Concept Introduction:
Molarity is defined as the moles of solute in 1-liter volume of a solution
The density of a solution is the ratio of its mass and volume i.e.
Answer to Problem 4E
The solution of 10.0 g KCl in 0.3 L water has the highest molarity and density.
Explanation of Solution
a)
Given:
Mass of KCl = 1.0 g
The volume of water solvent = 1.0 L
Calculation:
Based on equation (1) and (2):
Molar mass of KCl = 74.55 g/mol
b)
Given:
Mass of KCl = 5.0 g
The volume of water solvent = 0.5 L
Calculation:
Based on equation (1) and (2):
Molar mass of KCl = 74.55 g/mol
c)
Given:
Mass of KCl = 10.0 g
The volume of water solvent = 0.3 L
Calculation:
Based on equation (1) and (2):
Molar mass of KCl = 74.55 g/mol
The solution of 10.0 g KCl in 0.3 L water has the highest density.
Molarity can be expressed in terms of the solution density and solute molecular weight by combining equations (3) and (4) i.e.
Therefore,the molarity of a solution is directly proportional to its density.
Since 10.0 g of KCl in 0.3 L of water has the highest molarity; correspondingly it will also have the highest density.
The solution of 10.0 g of KCl in 0.3 L of water has the highest molarity and the highest density.
Chapter U4 Solutions
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