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20 terms

LC Chem 2.2 Ions and Tests for Ions

chemistry
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OH⁻
Hydroxide ion
HCO₃⁻
Hydrogencarbonate ion
CO₃²⁻
Carbonate ion
SO₄²⁻
Sulfate ion
SO₃²⁻
Sulfite ion
NO₃⁻
Nitrate ion
NO₂⁻
Nitrite ion
NH₄⁺
Ammonium ion
MnO₄⁻
Permanganate ion
CrO₄²⁻
Chromate ion
Cr₂O₇²⁻
Dichromate ion
S₂O₃²⁻
Thiosulfate ion
PO₄³⁻
Phosphate ion
(Test for) chloride ions
Add a few drops of silver nitrate solution (AgNO3). A white precipitate is formed which is soluble in dilute ammonia solution
(Test for) sulfate ions
Add a few drops of barium chloride solution (BaCl2). A white precipitate is formed which is insoluble in dilute HCl.
(Test for) sulfite ions
Add a few drops of barium chloride solution (BaCl2). A white precipitate is formed which dissolves in dilute HCl.
(Test for) carbonate ions
Add dilute HCl. Fizzing is observed as carbon dioxide is released. Add magnesium sulfate solution. A white precipitate is formed.
(Test for) hydrogencarbonate ions
Add dilute HCl. Fizzing is observed as carbon dioxide is released. Add magnesium sulfate solution. No precipitate is formed (it is soluble in water).
(Test for) nitrate ions
Brown Ring Test: Add iron (II) sulfate solution then add some concentrated sulfuric acid down the inside of the test tube. A brown ring is formed at the junction of the two layers
(Test for) phosphate ions
Add some ammonium molybdate solution then add five drops of concentrated nitric acid. Warm the solution. A yellow precipitate is formed.