- Explain how the technique of chromatography can be actively used to physically separate mixtures and provide vital information to help identify unknown chemical substances.
- Describe the fundamental scientific components of chromatography, explicitly noting the requirement of a stationary phase and a mobile phase.
- Understand that the chemical separation in chromatography solely depends on the relative distribution of substances between the stationary and mobile phases.
- Express the exact ratio of the distance moved by a compound to the distance moved by the solvent as the Retention factor (Rf value):
Rf=distance moved by solventdistance moved by substance
- Understand that different chemical compounds typically display different Rf values in varying solvents, a property utilized to confidently identify compounds.
- Explain that the compounds within a mixture may separate into multiple visible spots depending on the solvent used, whereas a chemically pure compound will invariably produce a single distinct spot in all solvents.
- Explain the detailed mechanism by which paper chromatography effectively separates complex mixtures.
- Suggest how specialized chromatographic methods can be effectively utilized for distinguishing pure chemical substances from impure substances.
- Interpret experimental chromatograms and accurately calculate precise Rf values from chromatogram data.
- Provide mathematical answers concerning Rf values to an appropriate number of significant figures.
- Conduct practical investigations using paper chromatography to actively separate and differentiate between distinct colored substances while calculating their respective Rf values.
