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All the chemical tests for the Edexcel IGCSE Chemistry syllabus.

H₂O

Turns anhydrous copper sulfate from white to blue

H₂

Burns with a squeaky pop

O₂

Relights a glowing splint

CO₂

Bubble through limewater which turns milky

NH₃

Turns damp red litmus paper blue

Cl₂

Turns damp blue litmus paper red

Li⁺

Flame test: crimson

Na⁺

Flame test: golden yellow

K⁺

Flame test: lilac

Ca ²⁺

Flame test: brick red

NH₄⁺

Warm with sodium hydroxide solution and test gas damp red litmus for ammonia

Cu²⁺

Forms a pale blue precipitate with sodium hydroxide

Fe³⁺

Forms a brown precipitate with sodium hydroxide

Fe²⁺

Forms a green precipitate with sodium hydroxide

Cl⁻

Forms a white precipitate with dilute nitric acid and silver nitrate

Br⁻

Forms a cream precipitate with dilute nitric acid and silver nitrate

I⁻

Forms a yellow precipitate withdilute nitric acid and silver nitrate

SO₄²⁻

Forms a white precipitate with dilute hydrochloric acid and barium chloride

CO₃²⁻

Add dilute hydrochloric acid and bubble the gas produced through limewater

water

Turns anhydrous copper sulfate from white to blue

hydrogen

Burns with a squeaky pop

oxygen

Relights a glowing splint

carbon dioxide

Bubble through limewater which turns milky

ammonia

Turns damp red litmus paper blue

chlorine

Turns damp blue litmus paper red

lithium ion

Flame test: crimson

sodium ion

Flame test: golden yellow

potassium ion

Flame test: lilac

calcium ion

Flame test: brick red

ammonium ion

Warm with sodium hydroxide solution and test gas damp red litmus for ammonia

copper ion

Forms a pale blue precipitate with sodium hydroxide

iron III ion

Forms a brown precipitate with sodium hydroxide

iron II ion

Forms a green precipitate with sodium hydroxide

choride ion

Forms a white precipitate with dilute nitric acid and silver nitrate

bromide ion

Forms a cream precipitate with dilute nitric acid and silver nitrate

iodide ion

Forms a yellow precipitate withdilute nitric acid and silver nitrate

sulfate ion

Forms a white precipitate with dilute hydrochloric acid and barium chloride

carbonate ion

Add dilute hydrochloric acid and bubble the gas produced through limewater

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