Wednesday, 23 January 2013

POTASSIUM CARBONATE K2CO3

POTASSIUM CARBONATE K2CO3

Properties potassium carbonate K2CO3:
Potash. White. Melts without decomposition, on further heating decomposes. Very soluble in water (strong hydrolysis on the anion), creates a high alkaline environment. Reacts with acids, non-metals, oxides of nonmetals. Participates in exchange reactions.

Obtaining potassium carbonate K2CO3:
4 KO2 + 3 C (graphite) = 2 K2CO3 + CO2 (30° C).
4 KO2 + 2 CO2(humidity) = 2 K2CO3 + 3O2 (normal temp.).
2 KO2 + CO = K2CO3 + O2 (50° C).
2 KOH (conc.) + ЕO2 = K2EO3 + H2O (E = C, S),
KOH + CO2 = KHCO3 ↓ (in the ethanol).
2 KHCO3 = K2CO3 + CO2 + H2O (100—400° C).
KHCO3 + KOH conc.) = K2CO3 + H2O.
K2SO4 + Ca(OH)2 + 2 CO = KHCOO + CaSO4 (200° C, pressure),
2 KHCOO + O2 = K2CO3 + CO2 + H2O (700° C).

The chemical reactions with potassium carbonate K2CO3:
K2CO3 = K2O + CO2 (t>1200° C).
K2CO3 - 1,5 H2O = K2CO3 + 1,5 H2O (100—150° C, vacuum).
K2CO3 (diluted) + 12H2O = 2 [K(H2O)6]+ + CO32-,
CO32- + H2O ↔ HCO3- + OH-; PKo = 3,67.
K2CO3 + 2 HCl (diluted.) = 2KCl + CO2↑ + H2O.
K2CO3 (saturated) + 2 HClO4 (conc.., cold) = 2 KClO4 ↓ + H2O + CO2 ↑.
3 K2CO3 (conc.) + 2 H3PO4 (diluted) = 2 K3PO4 + 3 H2O + 3 CO2 ↑.
K2CO3 + 2 HF (diluted) = 2 KF + H2O + CO2 ↑,
K2CO3 + 4 HF(conc.) = 2 KHF2 + H2O + CO2 ↑.
K2CO3 + H2O + CO2 = 2 KHCO3 (30-40° C).
K2CO3 (diluted)+ H2O + 2 SO2 = 2 KHSO3 + CO2 ↑.
K2CO3 + CA(OH)2 (saturated) = CaCO3 ↓ + 2 KOH.
3 K2CO3 (conc., hot) + 3Е2 = 5KЕ + KЕO3 + 3 CO2 ↑ (Е = Cl, Br, I).
3 K2CO3 + 3 H2O (hot) + 2AlCl3 = 2 Al(OH)3 ↓ + 3 CO2 ↑ + 6 KCl.
3 K2CO3 + H2O + 2 FeBr3 = 6 KBr + 2 FeO(OH)4 + 3 CO2 ↑ (boiling).
K2CO3 + BaS2O6 = K2S2O6 + BaCO3 ↓.
K2CO3 + C (coke) + CaCN2 = 2 KCN + CACO3 (900° C).
K2CO3 + C (NH2)2O = 2 KOCN + 2 H2O (40 °C).

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