POTASSIUM BROMIDE KBr

Properties of potassium bromide KBr:

White, melts without decomposition. Readily soluble in water (without hydrolysis). Does not form сrystalline hydrates. Is not soluble in concentrated hydrobromic acid. Typical reducing agent.


Obtaining potassium bromide KBr:

2 K + E2 = 2KE (normal temp.; E = F, Cl, Br, I).

2 KI + E2 = 2KE + I2↓ (E = Cl, Br).

2 KBrO3 = 2 KBr + 3 O2 (t > 434°C).


Chemical reactions with potassium bromide KBr:

KBr (diluted) + 6H2O = [K(H2O)6]+ + Br- (pH=7).

2 KBr (solid) + H2SO4 (10-50% conc., cold) = K2SO4 + 2 HBr

2 KBr (solid) + 3 H2SO4 (conc. > 50% , hot) = 2 KHSO4 + Br2↑ + SO2↑ + 2H2O.

2 KBr + Cl2 = 2 KCl + Br2↑ (boiling).

5 KBr + 3 H2SO4 (diluted) + KBrO3 = 3 Br2 + 3 K2SO4 + 3H2O

2 KBr + 2 H2SO4 (conc.) + MnO2 = Br2 + K2SO4 + MnSO4 + 2 H2O   (boiling).

KBr + 3 H2O (hot) → Electrolysis → 3H2↑ (cathode) + KBrO3(anode).


 

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