4. You are a scientist working in a lab that processes pharmaceuticals. It\'s re

Question

4. You are a scientist working in a lab that processes pharmaceuticals. It's recently been found that the Adderall that vour company sells may have a concentration that is dangerously high. To determine the concentration in your company's Adderall pills, you make a solution containing 4.30 x 10:3 M Adderall and 3.20 x 10-3 M of compound Y. Then you run the solution in your GC and get peak heights of 1231 and 1287, respectively. In a separate experiment solution made from 1 pill of Adderall with compound Y, which has a concentration of 6.7 x 10-3 M. You get peak heights of 1543 and 1399 for Adderall and X respectively (a) What is the concentration of Adderall in the unknown sample? (b) Assuming a "safe" concentration of Adderall is 3.4 x 102 M, should you pull your pills off the market?

Explanation / Answer

(1) Given hA = 1231, hY = 1287

Concentration of A [A] = 4.30×10-3M

Concentration of B [B] = 3.20×10-3M

hA /[A] = F{hY/[B]} where F is the response factor

1231/4.30×10-3 = F{1287/3.20×10-3}

F = 0.711

(2) hA = 1543, [A] = unknown

hY = 1399, [Y] = 6.7×10-3M, F = 0.711

1543/[A] = 0.711{1399/6.7×10-3]

[A] = 10.39×10-3M

As the safe concentration for A is 3.4×10-2M, the concentration calculated is less than the safe concentration value of A, so it is safe to keep the pills in the market and is not required to pull off.

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