CO2 - CARBON DIOXIDE

Properties of carbon dioxide:

Colorless, heavier than air and thermally stable, under compression and cooling is readily converted into liquid and solid states. Solid CO2 ("dry ice") at room temperature is sublimated. Poorly water soluble, partially reacted with it. Shows acidic properties, reacts with alkalis, ammonium hydroxide. It is recovering by active metals, hydrogen, carbon.


Molar mass g/mol 44.01
Density g/litre 1.977

Methods for preparation of carbon dioxide:

CaCO3 = CaO + CO2 (900-1200° C).

CaCO3 + 2HCl(diluted) = CaCl2 +CO2↑ + H2O.

C + O2 = CO2 (600-700° C, burning on air),


Chemical reactions with carbon dioxide:

2CO2 = 2CO + O2 (above 2000° C).

8CO2 • 46H2O(solid) = 8CO2 + 46H2O (above -21° C).

CO2(solution) + H2O = CO2 • H2O(solution) = H2CO3(solution).

CO2 + NaOH(diluted) = NaHCO3,

CO2 + 2NaOH(conc.) = Na2CO3 + H2O.

CO2 + Ba(OH)2 = BaCO3↓ + H2O,

CO2 + BaCO3(solid) + H2O = Ba(HCO3)2(solution).

CO2 + NH3 • H2O = NH4HCO3.

CO2 + 4H2 = CH4 + 2H2O (200° C, catalyst Cu2O).

CO2 + C = 2CO (above 1000° C).

CO2 + 2Mg = C + 2MgO, 2CO2 + 5Ca = CaC2 + 4CaO (500° C).

2CO2 + 2Na2O2 = 2Na2CO3 + O2 (normal temp.).


 

Did you know?

The double-helix structure of DNA was discovered in 1953 by James Watson and Francis Crick. The length of a single human DNA molecule, when extended, is 1.7 metres (5 ft 5 in).