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Coloured ions

Coloured ions. L.O.: Explain the origin of the colour of a transition metal complex ion. Starter: worksheet 15.2 (cis-platin). c) What is the IUPAC name for cis -platin ? Z - diamminedichloridoplatinum ( ii ). Watch animation

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Coloured ions

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  1. Coloured ions L.O.: Explain the origin of the colour of a transition metal complex ion. Starter: worksheet 15.2 (cis-platin)

  2. c) What is the IUPAC name for cis-platin? Z-diamminedichloridoplatinum(ii)

  3. Watch animation • In pairs prepare to explain to the class why transition metals ions are coloured. You will be able to use the animation with the sound muted.

  4. COLOURED IONS a solution of copper(II)sulphate is blue because red and yellow wavelengths are absorbed blue and green not absorbed white light

  5. FINDING COMPLEX ION FORMULAE USING COLORIMETRY • a change of ligand can change the colour of a complex • this property can be used to find the formula of a complex ion • ight of a certain wavelength is passed through a solution • the greater the colour intensity, the greater the absorbance • the concentration of each species in the complex is altered • the mixture with the greatest absorbance identifies ratio of ligands and ions RED LIGHT WHITE LIGHT COLORIMETER BLUE FILTER SOLUTION

  6. FINDING COMPLEX ION FORMULAE USING COLORIMETRY • a change of ligand can change the colour of a complex • this property can be used to find the formula of a complex ion • ight of a certain wavelength is passed through a solution • the greater the colour intensity, the greater the absorbance • the concentration of each species in the complex is altered • the mixture with the greatest absorbance identifies ratio of ligands and ions Finding the formula of an iron(III) complex White light is passed through a blue filter. The resulting red light is passed through mixtures of an aqueous iron(III) and potassium thiocyanate solution. Maximum absorbance occurs first when the ratio of Fe3+ and SCN¯ is 1:1. This shows the complex has the formula [Fe(H2O)5SCN]2+

  7. To do: • Question on page 222 • Page 233, Q1a –Q1c • Extension: worksheet 15.3

  8. Coloured ions L.O.: Explain the origin of the colour of a transition metal complex ion.

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