PT_Group 17 (Part 2)

• F⁻

  fluoride ion

• Cl⁻

  chlorine ion

• Br⁻

  bromide ion

• I⁻

  iodide ion

• (1) higher  

  (2) higher

• (1) higher  

  (2) lower

• (1) lower  

  (2) lower

• (1) lower  

  (2) higher

• no displacement reaction occurs

• colourless aqueous potassium bromide turns red-brown

• Cl₂ (g) + KBr (aq) →  KCl (aq) + Br (aq)

• bromide ions are reduced to form aqueous bromine

• no displacement reaction occurs

• brown aqueous sodium iodide turns colourless

• Cl₂ (g) + 2 I⁻ (aq) → 2 Cl⁻ (aq) +  I₂ (aq)

• iodide ions are reduced to form aqueous iodine

• no displacement reaction occurs

• colourless aqueous potassium bromide turns red-brown

• I₂ (aq) + 2 KBr (aq) →

  2 KI (aq) + Br₂ (aq)

• bromide ions are oxidised to form aqueous bromine