Tests for Anions (-)

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1) Halide test
Halides are elements in group 7 of the periodic table - also known as halogens. This test has to be done in solution. If you start from a solid, it must first be dissolved in pure water.
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Method:
Add dilute nitric acid (HNO3) to the solution before adding silver nitrate (AgNO3). A precipitate is formed
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Chloride (Cl-)
White precipitate. Cl- + Ag+ ==> AgCl(s)
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Bromide (Br-)
Cream precipitate. Br- + Ag+ ==> AgBr(s)
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Iodide (I-)
Pale yellow precipitate. I- + Ag+ ==> AgI(s)
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2) Sulfate test
Ba2 + + SO4 2- ==> BaSO4 (s)
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Method:
Add dilute hydrochloric acid (HCl) to sample before adding Barium Chloride (BaCl). If there are sulfate ions present, a WHITE precipitate of Barium Sulfate will be produced
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3) Test for carbonates
CO3 2−
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Method:
Add HCl to substance. CO2 will be given off if carbonates are present
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Other cards in this set

Card 2

Front

Method:

Back

Add dilute nitric acid (HNO3) to the solution before adding silver nitrate (AgNO3). A precipitate is formed

Card 3

Front

Chloride (Cl-)

Back

Preview of the front of card 3

Card 4

Front

Bromide (Br-)

Back

Preview of the front of card 4

Card 5

Front

Iodide (I-)

Back

Preview of the front of card 5
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