An analysis of an unknown drug sample in a forensic lab reveals that the percentage composition is 83.8% C, 10.5% H and 5.7% N. the drug phencyclidine has the formula C17H25N.
a. is it possible that the unknown sample is phencyclidine? please explain your answer fully.
b. calculation of the % composition of each element by mass in phencylidine.
c. a comparion of phencyclidine's % composition with the composition of the unknown sample.
a. is it possible that the unknown sample is phencyclidine? please explain your answer fully.
b. calculation of the % composition of each element by mass in phencylidine.
c. a comparion of phencyclidine's % composition with the composition of the unknown sample.
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a. If the calculated C, H, and N percentages are the same, it would be possible given consideration for the error and purity of the sample analyzed.
b. MW of phenylcylidine = 12.01 x 17 = 204.1 %C = 204.1 x 100% /243.3 = 83.9%
1.008 x 25 = 25.2 %H = 25.2 x 100%/243.3 = 10.4%
14.0 x 1 = 14.0 %N = 14.0 x 100%/243.3 = 5.8%
= 243.3
c. within experimental error the analyses are close enough to suggest the sample is the same as phenylcyclidine. Confirmation should be made by running a mixed melting point determination. If no depression of the mp occurs, the sample is confirmed as phenylcyclidine. A comparison of NMR or IR would also confirm the identity.
b. MW of phenylcylidine = 12.01 x 17 = 204.1 %C = 204.1 x 100% /243.3 = 83.9%
1.008 x 25 = 25.2 %H = 25.2 x 100%/243.3 = 10.4%
14.0 x 1 = 14.0 %N = 14.0 x 100%/243.3 = 5.8%
= 243.3
c. within experimental error the analyses are close enough to suggest the sample is the same as phenylcyclidine. Confirmation should be made by running a mixed melting point determination. If no depression of the mp occurs, the sample is confirmed as phenylcyclidine. A comparison of NMR or IR would also confirm the identity.