You received a white powder which contains a mixture of caffeine, cocaine and amobarbital at non-trace levels as determi

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You received a white powder which contains a mixture of
caffeine, cocaine and amobarbital at non-trace levels as determined
by a GC-FID screen. Device a liquid-liquid extraction scheme in
order to isolate each of these three components for FTIR analysis.
Be specific in terms of which buffers (including pH), which organic
solvents and rational for employing these reagents. You will need
to look up the pKas of the three compounds. The following are the
pKa's of the three compounds
Caffeine:10.4
Cocaine:8.7
Amoberbital: 7.84