ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: kenhung123 on May 22, 2010, 01:26:40 pm

Title: Adsorption and desorption terminology
Post by: kenhung123 on May 22, 2010, 01:26:40 pm

Is it true I cannot use adsorption by itself? Because it can be adsorption onto stationary phase (slowing down movement) or adsorption onto mobile phase (speeding up movement)

Desorption from stationary=adsorption into mobile phase=faster movement of component?

Title: Re: Adsorption and desorption terminology
Post by: physics on May 22, 2010, 08:17:18 pm

yes and higher Rf value.

Title: Re: Adsorption and desorption terminology
Post by: crayolé on May 22, 2010, 10:28:35 pm

I've always said it adsorption onto the stationary phase and desorption back into the mobile phase

Title: Re: Adsorption and desorption terminology
Post by: kenhung123 on May 22, 2010, 10:36:18 pm

Also does the solvent move proportionally to the components in paper chromatography? Does the Rf value change with changing solvent front distances?

Title: Re: Adsorption and desorption terminology
Post by: crayolé on May 23, 2010, 01:15:48 am

Yes it does ;]
Since the Rf value is measured using the solvent front