Using C1V1=C2V2
What do all those things stand for?
 C1= concentration 1
 V1= volume 1
 C2= concentration 2
 V2= volume 2
So when do we use it?
 We need to make solutions from stock solutions.
 Example
 We need to make a 1x concentration of stain but it comes as a
10x concentration. We know we need 250 ml of the 1 x
solution for the experiment.
How do we figure it out?
 Fill in what we know:
 C1- 1ox
 V1-?
 C2- 1x
 V2- 250 ml
 Now set it up
10(V1)=(1)(250ml)
Now do the math!
10(V1)=(1)(250ml)
Now do the math!
10(V1)=(1)(250ml)
10v1=250 ml
10
10
Now do the math!
10(V1)=(1)(250ml)
10v1=250 ml
10
10
V1= 25 mL
So now how do we make it…
 1st we need to figure out the difference between how
much we want at the end and how much of our stock
we are adding so…
250 ml- 25 ml= 225 ml
(V2)
(V1)
The Steps
 Obtain 25 ml of Stock Solution and bring to volume
by adding 225 ml of water.
Partner Practice Problems