Tests For Anions Flashcards

1
Q

Chloride ions test

A

Add AgNO3 solution to solution of the solid

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2
Q

Chloride ions observation

A

White precipitate formed which is soluble in dilute ammonia solution

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3
Q

Chemical Formula for Chloride ions test

A

Ag+ + Cl- —> AgCl (precipitate)

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4
Q

Test for sulfate/sulfite ions

A

Add BaCl2 solution to a solution of the solid

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5
Q

Observation for sulfate/sulfite ions test

A

White precipitate formed

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6
Q

Chemical formula for sulfate/sulfite ions test

A

Ba2+ + SO42- —> BaSO4
Ba2+ + SO32- —> BaSO3

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7
Q

Distinguishing test for Sulfate/Sulfite

A

Add dilute HCl

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8
Q

Observation of distinguishing test for Sulfate/Sulfite

A

If precipitate remains= sulfate
If precipitate dissolves= sulfite

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9
Q

Chemical formula for sulfate/sulfite distinguishing test

A

BaSO4 + HCl —> no reaction
SO32- + 2H+ —> SO2 + H2O

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10
Q

Test for Carbonate/Hydrogen-carbonate ion

A

Add dilute HCl to the solid

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11
Q

Observation of test for Carbonate/Hydrogen-carbonate ions

A

Fizzing- gas given off that turns limewater milky

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12
Q

Chemical formula for test for Carbonate/Hydrogen-carbonate ions

A

CO32- + 2H+ —> CO2 + H2O
HCO3- + H+ —> CO2 + H2O
Ca(OH)2 + CO2 —> CaCO3(precipitate) + H2O

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13
Q

Distinguishing test for Carbonate/Hydrogen-Carbonate ions

A

Add MgSO4 to a fresh solution of the solid

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14
Q

Observation of distinguishing test for Carbonate/Hydrogen-Carbonate ions

A

White precipitate formed- Carbonate
No precipitate forms- hydrogen-carbonate (boiling gives precipitate)

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15
Q

Chemical formula for distinguishing test of Carbonate/Hydrogen-carbonate ions

A

Mg2+ + CO32- —> MgCO3 (precipitate)
Mg 2+ + HCO3- —> Mg(HCO3)2
Mg(HCO3)2 —> MgCO3(precipitate) + CO2 + H2O

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16
Q

Test for nitrate ions

A

Brown ring test: add freshly prepared FeSO4 solution to solution of the solid.
Add concentrated sulfuric acid

17
Q

Observation for test for nitrate ions

A

Brown ring formed

18
Q

Test for phosphate ions

A

Add ammonium molybdate to solution of the solid.
Add concentrated nitric acid.
Warm solution.

19
Q

Observation for test for phosphate ions

A

Yellow precipitate formed