A student wants to make 135. mL of 8.5 M KBr by diluting a 6.0 M KBr solution. How much of that solution should be used?

1 Answer
Mar 5, 2018

V = 101.25 mL from concentrated solution

Explanation:

Using the dilution equation:

(V M)_1 = (V M)_2

Where
V: volume (L)
M: molarity (mol/L)

So, substituting data in previous equation

(V x 8.5 "mol"/L)_1 = (0.135 L x 6"mol"/L)_2

Solving

V = 0.10125 L

Or,

V = 101.25 mL from concentrated solution