You have a stock solution of 15.8 m nh3. how many milliliters of this solution should you dilute to make 1000.0 ml of 0.250 m nh3?

The rule that will be used to solve this types of questions is:

M1 * V1 = M2 * V2

From the givens we have:

M1 = 15.8 m

V1 is unknown

M2 = 0.25 m

V2 = 1000 ml

Substitute with these givens in the above equation to get V1 as follows:

15.8*V1 = 0.25*1000

V1 = 15.82278 ml