If you dilute 27.0 mL of a 3.5 M solution to make 286.4 mL of solution, what is the molarity of the dilute solution?

Question

If you dilute 27.0 mL of a 3.5 M solution to make 286.4 mL of solution, what is the molarity of the dilute solution?

Answer 1

Amy,

 

Molarity (M) is the number of moles per volume (liters) of solution.

 

In the original solution there is 27.0 mL (1 L / 1000 mL) (3.5 moles / L) = 0.0945 moles.

 

There are 0.0945 moles in the diluted solution, too. Only water was added.

 

286.4 mL (1 L / 1000 mL) = 0.2864 L

 

0.0945 moles / 0.2864 mL =  0.330 M

 

Michael.