What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200 M solution to a final volume of 100.mL?
A)0.267 M
B)0.150 M
C)0.200 M
D)6.67 M
E)0.100 M

Question

Quizplus · Accepted Answer

Molarity, M = (moles of solute) / (volume of solution in liters)

We can use the formula:

M1V1 = M2V2

where M1 and V1 are the initial concentration and volume, and M2 and V2 are the final concentration and volume.

Plugging in the values:

M1 = 0.200 M
V1 = 75.0 mL = 0.075 L
V2 = 100.0 mL = 0.100 L

Solving for M2:

M2 = (M1V1) / V2
M2 = (0.200 M)(0.075 L) / 0.100 L
M2 = 0.150 M

Therefore, the molarity of the KCl solution made by diluting 75.0 mL of a 0.200 M solution to a final volume of 100.mL is 0.150 M. The best choice is B.

What Is the Molarity of a KCl Solution Made by Diluting