Sample Problem 3.14
Preparing a Dilute Solution from a Concentrated Solution
PROBLEM:
Isotonic saline is a 0.15 M aqueous solution of NaCl that simulates the total concentration of ions found in many cellular fluids. Its uses range from a cleaning rinse for contact lenses to a washing medium for red blood cells (erythrocytes). How would
PLAN:
The number of moles of solute does not change during the dilution but volume does. The new volume will be the sum of the two volumes, that is, the total final volume.
Mdil x Vdil = # mol solute = Mconc x Vconc
SOLUTION:
0.80 L soln
= 0.020 L soln
0.12 mol NaCl
= 0.12 mol NaCl
x
x
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