Leaving Cert Chemistry- Anion Tests

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8 Terms

1
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Carbonate and hydrogencarbonate

add dilute HCL to carbonate or hydrogencarbonate

Gas produced turns limewater milky. (CO2)

2
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Carbonate

Add MgSO4 to solution

White precipitate

3
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Hydrogencarbonate

Add MgSO4 to solution

White precipitate on heating

4
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Sulfate

Add BaCl2 to solution

White precipitate that is insoluble in dilute HCL

5
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Sulfite

Add BaCl2 to solution

White precipitate that is soluble in dilute HCL

6
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Chloride

Add AgNO3 to solution

White precipitate that is soluble in dilute NH3

7
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Nitrate

Mix with cold FeSO4, pour conc. H2SO4 at an angle down the side of the testtube.

brown ring forms at junction of two liquids

8
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Phosphate

Add ammonium molybdate reagent and conc. nitric acid. heat gently

yellow precipitate of ammonium phosophomolybdate