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# Spectroscopy question watch

1. Can someone please explain to me a) , what do they exactly mean by adsorbtion???
As for B), I completely do not understand it 😭
It says that mobile phase is non polar therefore means that most one soluble in it will travel faster (have highest detector response according to graph) therefore we pick the one that is nonpolar as it will be the most soluble right??? Isn't that X!!!!!!
Pleaseee could u explain in details
Thanks x
2. (Original post by pondsteps)

Can someone please explain to me a) , what do they exactly mean by adsorbtion???
As for B), I completely do not understand it 😭
It says that mobile phase is non polar therefore means that most one soluble in it will travel faster (have highest detector response according to graph) therefore we pick the one that is nonpolar as it will be the most soluble right??? Isn't that X!!!!!!
Pleaseee could u explain in details
Thanks x
a) Adsorption is where the substance adheres to the surface of a liquid or solid by means of intermolecular bonds.

b) The mobile phase is non-polar. So non-polar substances will travel in mobile phase more likely than adsorb to the stationary phase.

So, the more non-polar, the more likely it will travel in the mobile phase and reach the detector quicker. W is the earliest peak we see. So it's the most non-polar

Spoiler:
Show

Think of it like a race. Non-polar runners will run across the track, but me and my polar shoes will adsorb to the ground and I'll move slower. Thus I won't reach the finish until last. The most non-polar will win the race.
3. (Original post by telepathicnine)
a) Adsorption is where the substance adheres to the surface of a liquid or solid by means of intermolecular bonds.

b) The mobile phase is non-polar. So non-polar substances will travel in mobile phase more likely than adsorb to the stationary phase.

So, the more non-polar, the more likely it will travel in the mobile phase and reach the detector quicker. W is the earliest peak we see. So it's the most non-polar

Spoiler:
Show

Think of it like a race. Non-polar runners will run across the track, but me and my polar shoes will adsorb to the ground and I'll move slower. Thus I won't reach the finish until last. The most non-polar will win the race.

Ohh I get it thanks for the clear explanation!!! Does the length of the peak just show the abundance of each substance? Also when it says adsorbed it means that the stationary phase is solid right? Bcz if it was liquid it would have been absorbed ? Am I correct or not
4. (Original post by pondsteps)
Ohh I get it thanks for the clear explanation!!! Does the length of the peak just show the abundance of each substance? Also when it says adsorbed it means that the stationary phase is solid right? Bcz if it was liquid it would have been absorbed ? Am I correct or not
The area under the curve is proportional to the abundance.
5. (Original post by charco)
The area under the curve is proportional to the abundance.
Isnt that NMR spectrum?
6. (Original post by pondsteps)
Isnt that NMR spectrum?
... and chromatography.
7. (Original post by charco)
... and chromatography.
Thank you xxxxx

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