Question

How many milliliters of 0.500 m kcl solution would you need to dilute to make 100.0 ml of 0.100 m kcl?

Answer 1

Given:
 Concentration 1 = 100.0 ml              Concentration 2 = ?
 Volume 1 = 0.100 M KCL                  Volume 2= 0.500 M KCL

Find Concentration 2

To get the concentration 2, follow this formula

C1V1 = C2V2

Solution

(100.0 ml) (0.100 m kcl) = (X ml) (0.500 m kcl)
 transfer the volume 2 to the left side

(100.0 ml) (0.100 m kcl) = X ml
---------------------------------
            0.500 m kcl

10.00ml / m kcl = Xml
--------------------                   cancel the m kcl to let the ml be the remaining variable
0.500 m kcl

20.0 ml = x ml

So you will need 20.0 ml of 0.500 m kcl to made the solution of 100.0 ml of 0.100 m kcl