5.8.1 Purity, formulations and chromatography

You will need to use a combination of the materials we have collected here to enable you to succeed. The most important factor will always be your effort. Use the knowledge of your teacher, attend revision sessions, ask when you need help. Most importantly of all, stay confident! You can do this!

Learning Checklist & Knowledge Organiser

5.8.1 Purity, formulations and chromatography (Higher & Foundation)

Define a pure substance and identify pure substances and mixtures from data about melting and boiling points
Describe a formulation and identify formulations given appropriate information
Describe chromatography, including the terms stationary phase and mobile phase and identify pure substances using paper chromatograph
Explain what the Rf value of a compound represents, how the Rf value differs in different solvents and interpret and determine Rf values from chromatograms
Required practical 12: investigate how paper chromatography can be used to separate and tell the difference between coloured substances (inc calculation of Rf values)