How would you use chromatography to determine whether an unknown pure liquid....

AI Thread Summary
To determine whether an unknown pure liquid is 1-pentene, cis-2-pentene, or trans-2-pentene, chromatography can be utilized by comparing retention times with known samples. The boiling points of the substances indicate that 1-pentene has a lower boiling point than the cis and trans isomers, which are similar. Gas-liquid chromatography (GC) is suggested as a suitable method, although the question does not explicitly require it. Retention time analysis is crucial since it allows for differentiation based on both boiling point and polarity. Ultimately, using GC can effectively identify the unknown liquid by comparing its behavior to known standards.
UKWildcat
Messages
4
Reaction score
0

Homework Statement


How would you use chromatography to determine whether an unknown pure liquid is 1-pentene, cis-2-pentene, or trans-2-pentene?


Homework Equations





The Attempt at a Solution


I looked up the boiling points of the three and see that 1-pentene is lower, but the cis and trans pentene are similar. This is where I am stuck.
 
Physics news on Phys.org
I can be wrong, but seems to me like best method would be to compare retention time with known sample of substances in question. When you have a single substance and no reference, determining what the unknown is is like reading the dregs.
 
The title is "GC help" but the question doesn't specify that you utilize gas-liquid chromatography. Also, GC separations are largely a function of BP but polarity plays a part as well.
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
View full post »

Thread 'Prove that evolution is constant (Provide at least two arguments to support your position)'

I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
View full post »

Similar threads

Eliminating Alcohols: Why Do (A) and (B) Give Different Products?
Replies
3
Views
2K
Which chromatography test fits best?
Replies
2
Views
2K
How Does Recombination Frequency Affect Genetic Linkage?
Replies
1
Views
3K
How Many Stereoisomers Do Hexadecanoic Acid and Oleic Acid Have?
Replies
4
Views
2K
What is the Identity of the Unknown Liquid Used in a Dumas Bulb Experiment?
Replies
3
Views
2K
How does one prepare standards for headspace gas chromatography?
Replies
1
Views
2K
Most Exothermic Combustion of Hydrocarbon
Replies
5
Views
4K
Isomers of [Fe(SCN)2(H2O)4]: How Many Possibilities?
Replies
2
Views
3K
IUPAC Naming of Organic Compounds: Cis and Trans Isomers with Substituent Groups
Replies
1
Views
3K
Determining Solubility in Acidic Solutions / Pure Water
Replies
3
Views
3K

Hot Threads

Recent Insights

Back
Top