A student adds 0.250 L of 200 mM buffer stock solution to a volumetric flask and dilutes the stock to 1.0 L. What is the final concentration of the solution?
A) 0.11 mmol
B) 110 mmol
C) 11 mmol
D) 50 mmol
E) 5.0 mmol

Question

Quizplus · Accepted Answer

To calculate the final concentration of the solution, we need to use the formula:

C1V1 = C2V2

where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

We know that:
- C1 = 200 mM
- V1 = 0.250 L
- V2 = 1.0 L

Plugging these values into the formula and solving for C2:

200 mM x 0.250 L = C2 x 1.0 L
50 mmol = C2

Therefore, the final concentration of the solution is 50 mmol, which is equivalent to 11 mmol/L (millimoles per liter). So the correct answer is C.

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