High School

What volume of a 0.9 M KF solution would need to be diluted in a 100 mL flask to have a final concentration of 0.35 M?

A. 25.7 mL
B. 19.4 mL
C. 38.8 mL
D. 0.257 mL

Answer :

Final answer:

The volume of the 0.9 M KF solution that needs to be diluted in a 100 ml flask to have a final concentration of 0.35 M is approximately 38.8 ml.

option 4 is correct

Explanation:

To calculate the volume of the 0.9 M KF solution that needs to be diluted, we can use the dilution formula:

C1V1 = C2V2

Where:

  • C1 = initial concentration of the solution = 0.9 M
  • V1 = initial volume of the solution (unknown)
  • C2 = final concentration of the solution = 0.35 M
  • V2 = final volume of the solution = 100 ml

Substituting the values into the formula:

(0.9 M)(V1) = (0.35 M)(100 ml)

Solving for V1:

V1 = (0.35 M)(100 ml) / 0.9 M

V1 ≈ 38.8 ml

Therefore, the volume of the 0.9 M KF solution that needs to be diluted in a 100 ml flask to have a final concentration of 0.35 M is approximately 38.8 ml.

Learn more about dilution of solutions here:

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