Please enable JavaScript.
Coggle requires JavaScript to display documents.
Tests for Positive and Negative Ions (Negative Ions (Halide Ions (Add a…
Tests for Positive and Negative Ions
Positive Ions
NaOH Test -
Excess NaOH
Iron (III)
Brown precipitate
Not Dissolved
Aluminum
White precipitate
Re-Dissolves
Iron (II)
Green precipitate
Turns brown (Fe (II) > Fe (III))
Calcium
White precipitate
Not Dissolved
Copper (II)
Blue precipitate
Not dissolved
Magnesium
White precipitate
Not Dissolved
Flame Test
Lithium
Red
Barium
Apple Green
Potassium
Lilac
Magnesium
No Change
Calcium
Brick Red
Copper
Green/Blue
Sodium
Yellow
Strontium
Red
Negative Ions
Carbonate Ions
Add HCl and test for gas
Effervescent, Limewater turns cloudy: gas is CO2
Sulphate Ions
Add diluted BaCl2
White precipitate (BaSO4)
Halide Ions
Add a little HN03 (to remove OH or CO3 ions)
Add a little AgNO3(aq)
Chlorine
White precipitate
Bromine
Cream Precipitate
Iodine
Yellow Precipitate