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.
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