The following silica TLC plate shows three compounds A, B, and C developed insid
ID: 1063962 • Letter: T
Question
The following silica TLC plate shows three compounds A, B, and C developed inside a jar containing benzene solvent. A filter paper was in and the jar was capped during the process. R_f of A = 0.6 R_f of B = 0.35 R_f of C = 0.8 On the right side (marked A + B) of the TLC plate above, draw what a mixture of A & B would look like on a TLC (thin layer chromatography) plate, using the same solvent benzene. The least polar compound above is A B C Benzene would be an ideal solvent to use In I lush chromatography to separate compound A from compounds B and C compound B from compounds A and C compound C from compounds A and B all of the above none of the above The most likely cause of the appearance of spot C is too little solvent vapor inside the chromatographic jar filter paper wasn't fully wet inside the jar spot contains too high a sample concentration spot contains too little of the product spot is too volatile The stationary (or immobile) phase in this case is: alumina benzene silica compound compound B If the TLC jar is not saturated with solvent vapor, the R_f value of A will be less than 0.6 remain unchanged at 0.6 greater than 0.6 cannot be determined if the solvent were changed to ethyl acetate, the R_f value of A would be less than 0.6 remain unchanged at 0.6 greater than 0.6 cannot be determined In gas chromatography, the stationary phase is a solid liquid gas plasmaExplanation / Answer
1.
2. least polar compound is C.Less polar compounds are less strongly attached with the stationary phase of the tlc and as a result it will move faster.
3. answer :d. Benzene is a non-polar solvent. It will dissolve C to a greatest extent , followed by A and then B. There is significant difference in their polarity as indicated by the Rf values.
4. sample concentration is high
5. stationary phase is alumina
6. more than 0.6 as the value of distance travelled by the solvent will be less.
7.greater than 0.6. Ethyl acetate is more polar compared to benzene . The spot for A will move further ans as a result value of Rf will be more.
8.c. mobile phase is a gaseous.