Gas Evolution Reactions

Question 1

Reactant type: Sulfides

Answer 1

No intermediate

Evolves H₂S

Ex: 2HCl_(aq) + K₂S_(aq) → H₂S_(g) + 2KCl_(aq)

Question 2

Reactant type: Carbonates and bicarbonates

Answer 2

Intermediate: H₂CO₃

Evolves: CO₂

Ex: 2HCl_(aq) + K₂CO_3(aq) → H₂O_(l) + CO_2(g) + 2KCl_(aq)

Question 3

Reactant type: Sulfites and bisulfites

Answer 3

Intermediate: H₂SO₃

Evolves: SO₂

Ex: 2HCl_(aq) + K₂SO_3(aq) → H₂O_(l) + SO_2(g) + 2KCl_(aq)

Question 4

Reactant type: Ammonium

Answer 4

Intermediate: NH₄OH

Evolves: NH₃

Ex: NH₄Cl_(aq) + KOH_(aq) → H₂O_(l) + NH_3(g) + KCl_(aq)