Identification of Anions Flashcards
What are halides?
Halides are anions derived from halogen elements.
What is the formula for Carbonate?
The formula for Carbonate is CO₃²⁻.
What is the formula for Chloride?
The formula for Chloride is Cl⁻.
What is the formula for Bromide?
The formula for Bromide is Br⁻.
What is the formula for Iodide?
The formula for Iodide is I⁻.
What is the formula for Nitrate?
The formula for Nitrate is NO₃⁻.
What is the formula for Sulfate?
The formula for Sulfate is SO₄²⁻.
What is the formula for Sulfite?
The formula for Sulfite is SO₃²⁻.
What is the test for carbonates and state its result
Add dilute acid.
Production of carbon dioxide indicates presence of carbonate ions
What is the test for halides?
Add nitric acid, then add aqueous silver nitrate.
Result: ppt, the more reactive halide (lower position in reactivity series) produces darker ppt.
Chloride = white
Bromide = cream
Iodide = yellow ppt
What is the test for nitrate ions
Add aqueous sodium hydroxide, then add aluminium.
Result: Ammonia produced turns damp red litmus paper blue.
What is the test for sulfate?
Add nitric acid, then add aqueous barium nitrate.
Result: White ppt.
What is the test for sulfite?
Add dilute HCl, warm gently.
Result: SO₂ produced turns acidified potassium manganate from purple to colourless.
What is the result of adding dilute acid in the test of carbonates
CO₂ produced makes limewater cloudy.
