Determine the concentration of a solution prepared by diluting 20.0 mL of a 0.200 M LiCl to 250.0 mL.
A) 0.160 M
B) 0.0320 M
C) 2.50 M
D) 0.00800 M
E) 0.0160 M

Question

Quizplus · Accepted Answer

Use the dilution equation:

M1V1 = M2V2

where:

M1 = initial concentration 
V1 = initial volume 
M2 = final concentration 
V2 = final volume

Plugging in:

M1 = 0.200 M 
V1 = 20.0 mL = 0.020 L 
M2 = ? 
V2 = 250.0 mL = 0.250 L

0.200 M x 0.020 L = M2 x 0.250 L

M2 = 0.0160 M

Therefore, the final concentration of LiCl in the solution is 0.0160 M, which corresponds to choice E.

Determine the Concentration of a Solution Prepared by Diluting 20