Multiple Choice
Which of the following is the correct way to create a more dilute solution from an existing solution?
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6. Chemical Quantities & Aqueous Reactions
Dilutions
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Which of the following stays constant when diluting a solution?
A
The concentration of the solution
B
The volume of the solution
C
The number of moles of solute
D
The mass of solvent
Verified step by step guidance1
Understand the concept of dilution: Dilution involves adding more solvent to a solution, which increases the total volume but does not change the amount of solute present.
Recall that the number of moles of solute is the actual quantity of solute particles in the solution, which remains unchanged during dilution because no solute is added or removed.
Recognize that the concentration of the solution changes because concentration is defined as moles of solute per unit volume, and volume increases upon dilution.
Note that the volume of the solution increases when solvent is added, so it does not stay constant.
Understand that the mass of solvent increases as more solvent is added, so it also does not stay constant during dilution.
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