Answer :
To obtain a final concentration of 0.35 M using a 0.9 M KF solution in a 100 ml flask, approximately 38.89 ml of the KF solution needs to be diluted.
To calculate the volume of a 0.9 M KF solution that needs to be diluted in a 100 ml flask to have a final concentration of 0.35 M, 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 given values into the formula, we can solve for V1:
(0.9 M)(V1) = (0.35 M)(100 ml)
V1 = (0.35 M)(100 ml) / (0.9 M)
V1 ≈ 38.89 ml
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