What is the molarity of the resulting solution when 400.mL of a 0.400 M solution is diluted to 800.mL?
A)1.20 M
B)0.800 M
C)0.200 M
D)0.133 M

Question

Quizplus · Accepted Answer

Molarity is given by:
Molarity = (moles of solute) / (volume of solution in liters)
From the initial solution:
moles of solute = Molarity x volume of solution in liters
moles of solute = 0.400 M x 0.400 L = 0.160 moles
When this solution is diluted to a total volume of 800 mL, the final volume of solute is still the same (0.160 moles), but the volume of the solution has increased.
Using the molarity formula:
Molarity = (moles of solute) / (volume of solution in liters)
Molarity = 0.160 moles / 0.800 L = 0.200 M
Therefore, the molarity of the resulting solution is 0.200 M.

What Is the Molarity of the Resulting Solution When 400