many ionic compounds are coloured. the colour of the compound is caused by the metal ion which is...

Colour of Ions

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Page 1: Many ionic compounds are coloured. The colour of the compound is caused by the metal ion which is present in the compound. It is usually a transition

Colour of Ions

Many ionic compounds are coloured. The colour of the compound is caused

by the metal ion which is present in the compound. It is usually a transition metal ion which gives the colour to ionic compounds.

Compound Colour Ion responsible for colour

copper(II) sulphate or copper(II) nitrate. Blue

Copper(II) orCu2+

Nickel(II) sulphate or nickel(II) chloride Green Nickel(II) or Ni2+

Sodium chromate or potassium chromate

YellowChromate or CrO4

Page 4: Many ionic compounds are coloured. The colour of the compound is caused by the metal ion which is present in the compound. It is usually a transition

Migration of IonsBeing able to watch ions move depends

on two facts:ions have electrical charges and many ions have characteristic colours

These allow us to observe the movement, or migration, of ions when we apply an electric current to an ionic solution.

Page 5: Many ionic compounds are coloured. The colour of the compound is caused by the metal ion which is present in the compound. It is usually a transition

A DC power supply connected to copper(II) dichromate solution.

Orange negative dichromate ions (Cr2O7

2-) attracted to positive electrode

Green copper (II) dichromate solution

Blue positive coppers ions (Cu2+) attracted to positive electrode

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