What you’ll learn3 learning objectivesChoose one objective for a focused lesson, or study the complete topic.37.1.1And understand the terms• Describe and understand the terms: (a) stationary phase, e.g. aluminium oxide (on a solid support); (b) mobile phase; a polar or non-polar solvent; (c) Rf value; (d) solvent front and baselineSyllabus objective37.1.2Rf values• Interpret Rf valuesSyllabus objective37.1.3Differences in Rf values• Explain the differences in Rf values in terms of interaction with the stationary phase and of relative solubility in the mobile phaseSyllabus objective