Chemistry: Chemical Analysis: Key terms

• Pure


  a substance that contains only one type of element or compound
• Formulation

  a mixture that has been carefully designed to have specific properties
• Chromatography


  a separation technique used to separate the coloured components of mixtures
• Stationary phase


  in chromatography, the phase that does not move (e.g. the absorbent paper
• Mobile phase


  in chromatography, the phase that does move (e.g. the solvent)
• Flame emission spectroscopy


  an instrumental method of analysis, which is used to identify the metal ions in a solution and measure their concentration
• Flame tests


  a way of identifying metal ions from the colour produced when the metal compound is heated in a flame
• Precipitate


  a solid formed when two solutions are combined
• Insoluble


  a substance that does not dissolve in a solvent
• Halide


  a halogen ion, e.g. fluoride, chloride, bromide or iodide