anion identification

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6 Terms

1
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Halides - precipitate

Add silver

  • If white, then Cl

  • If cream, then Br

  • If yellow, then I


<p>Add silver</p><ul><li><p>If white, then Cl</p></li><li><p>If cream, then Br</p></li><li><p>If yellow, then I</p></li></ul><p></p>
2
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Hydroxide - precipiate or indicator

Precipiate

  • add Cu, and it will turn blue


Indicator

  • red litmus will turn blue

  • universal indicator will turn blue


3
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Acetate CH3COO - indicator

Acetate is the conjugate base of acetic acid, and because acetic acid is a weak acid, acetate is a strong base

  • red litmus turns blue and universal indicator turns blue


4
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Carbonate

Add nitric acid (HNO3) and CO2 will be produced, forming bubbles

HNO3 + CO3 produces NO3 + H2O + CO2

5
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Sulphate - precipitate

Add ACIDIFIED barium ions to produce a WHITE precipitate

  • firstly add a few strops of drops of dilute nitric acid first to remove any carbonate ions


6
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Phosphate - precipitate

Add ALKALINE barium ions to produce a WHITE precipitate