ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: lacoste on April 01, 2009, 08:10:01 pm

Title: paper chromatography
Post by: lacoste on April 01, 2009, 08:10:01 pm: why do different solvents give different chromatograms?
Title: Re: paper chromatography
Post by: dekoyl on April 01, 2009, 08:16:49 pm: Polarity between solvent and mobile phase (solvent).
Title: Re: paper chromatography
Post by: jackinthepatch on April 01, 2009, 08:17:17 pm: Well...every solvent will have different bonding properties with the components under analysis. So if the solvent used bonds more strongly with the component, then the component will move further along the paper. This will give a different chromatogram to a different solvent, which may have weaker bonding with the component, meaning it will adsorb onto the paper sooner.

Hope that made sense lol =S
Title: Re: paper chromatography
Post by: TrueTears on April 01, 2009, 08:21:14 pm: The stronger the bond with the solvent, means it will move further up the paper like jackinthepatch said hence the bigger then $R_f$ value.
Title: Re: paper chromatography
Post by: NE2000 on April 02, 2009, 10:59:46 am: And as a result, not just different solvents but other differing conditions which have any effect on the interplay between adsorption and desorption as the sample components travel up the paper can change your final chromatogram.