19.3

What are the reagents to obtain carbon dioxide gas?

Calcium Carbonate and dilute hydrochloric acid

What are the reagents to obtain hydrogen gas?

Zinc and dilute hydrochloric acid

What are the reagents to obtain oxygen gas?

Hydrogen peroxide and manganese (VII) oxide catalyst

What’s the test for ammonia gas?

Damp red litmus paper: turns blue

What’s the test for CO₂ gas?

Bubble gas through lime water: turns milky

What’s the test for Cl₂ gas?

Damp litmus paper: turns white (bleached)

What’s the test for H₂ gas?

Lighted splint: Squeaky pop

What’s the test for O₂ gas?

Glowing splint: Lights up

What’s the test for SO₂ gas?

Filter paper with purple potassium manganese (VII): turns colorless

Example gases heavier than air (upwards displacement)

HCl, CO₂, SO₂

Example gases lighter than air (downwards displacement)

O₂, NH₃

Example gases sparingly soluble in water (over water)

O₂, H₂, CO₂