How Many Extractions Are Needed to Reduce Stearic Acid to 0.08%?

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il postino
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Homework Statement
Determine the number of extractions from a solution
Relevant Equations
ni (alfa) = ni . f^n
Hi all!
The distribution constant of stearic acid between n-heptane and acetic acid is 4.95 at
25 ° C. Determine the number of extractions from a solution of stearic acid in acid
acetic acid, with successive portions of n-heptane of equal volume to the solution, necessary
to reduce the residual content of stearic acid in the acetic acid layer to 0.08% of
its original value.I don't know where to start, could you help me?
 
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Discussion

How much original stearic acid (what fraction of it) is left in the acetic acid after a single extraction?
 
[QUOTE = "Borek, publicación: 6389436, miembro: 23711"]
¿Cuánto ácido esteárico original (qué fracción) queda en el ácido acético después de una única extracción?
[/ CITAR]

0.92%?
 
And your relevant equations are pretty unhelpful. If you wrote out the definition of distribution constant, and defined what symbols mean you would be most of the way to solving the problem.