DILUTIONS

-When two solutions are mixed the concentration changes
-Dilution is the process of decreasing the concentration by adding a solvent ( usually water)
-The amount of solute does not change n1=n2
-Because concentration is mol/L we can write
C=m/v
n-cv so c1v1=c2v2
Example
-How much water must be added to 10.mL of 10.0M Na2So4 to give a solution with a concentration of 0.50M?

c1v1=c2v2
(0.01L)(10.0M)=(0.50M) v2
v2=0.200L
200mL-10mL=190mL

KP