Periodicity - Reactions of Group 17 (Halogens)

General reaction of Halogens with water

X2 + H2O ----> HX + HOX (X= Halogen)

Flourine reaction with water

F2 (g) + H2O (l) ----> 2HF (aq) + 1/2 O2 (g)

Clorine reaction with water

Cl2 (g) + H2O(l) → HCl(aq) + HOCl(aq)

Bromine reaction with water

Br2 (l) +H2O(l) → HBr(aq) + HOBr(aq)

Iodine reaction with water (Keep in mind it doesn't react with PURE water)

I2 (s) + I- (aq) → I3- (aq)

General reaction of hydrogen halides with water

HX + H2O → H3O+ + X- (X= Halogen)

Hydrogen Flouride reaction with water

HF(g) + H2O(l) → H3O+ (aq) + F- (g)

Hydrogen Chloride reaction with water

HCl(g) + H2O(l) → H3O+(aq) + Cl- (g)

Hydrogen Bromide reaction with water

HBr(g) + H2O(l) → H3O+(aq) + Br- (g)

Hydrogen Iodide reaction with water

HI(g) + H2O(l) → H3O+(aq) + I- (g)

General reaction of halides with silver nitrate

X- (aq) + Ag+ (s) → AgX (s)

Chloride reaction with silver nitrate

Cl- (aq) + Ag+ (s) → AgCl(s) white ppte

(Darkens on exposure in light)

Bromide reaction with silver nitrate

Br - (aq) + Ag+ (s) → AgBr(s) cream ppte

Iodide reaction with silver nitrate

I- (aq) + Ag+ (s) → AgI (s) pale yellow ppte

Halogen displacement reactions

Occur when a more reactive halogen displaces a less reactive halogen from solutions of its salts

Chlorine and Bromine displacement reaction

Cl2(g) + 2Br-(aq)→ 2Cl-(aq) + Br2(aq)

Chlorine and Iodine displacement reaction

Cl2(g) + 2I-(aq)→ 2Cl-(aq) + I2(aq)

Bromine and Iodine displacement reaction

Br2(l) + 2I-(aq)→ 2Br-(aq) + I2(aq)