Carbon 2 Flashcards
(11 cards)
uses of CO2
Fizzy drinks
formation of dry ice- used as a refrigerant
In fire extinguishers- replace the O2
Solubility Of CO2 in H2O and in alkali
CO2 + H2O ( reversible ) H2CO3
CO2 is an acidic oxide and therefore can react with an alkali via neutralization
CO2 + 2NaOH –> Na2CO3 + H2O
Carbonates. All carbonates are insoluble except
sodium, potassium and ammonium
what is precipitation?
The process of transforming a dissolved substance into an insoluble solid from a super saturated solution
Preparation of insoluble salts by precipitation.
How would you prepare. CaCO3. PbCO3
Ca(NO3)2 + Na2CO3 –> 2NaNO3 + CaCO3
Pb(NO3)2 + Na2CO3 –> PbCO3 + 2NaNO3
Nitrates and sodium salts are always soluble
Complete combustion
CO2 is formed when a substance burns in excess O2
C + O2 –> CO2
Incomplete combustion
CO is formed when a substance burns in a limited amount of O2. (Soot)
Equation of limited O2
Equation of excess O2
( see notes )
Properties Of CO
1a. neutral gas- doesn’t react with acids and bases 1
b. not acidic
c. basic or amphoteric
- Toxic gas: binds to haemoglobin irreversibly replacing O2
- Combusts: CO combusts in the presence of O2 to give CO2. 2CO + O2 –> 2CO2
- Reducing action: Acts as a reducing agent by removing the O2 from metal oxides liberating the metal itself turning into CO2. 2CO + O2 –> 2CO
How to obtain CO from CO/CO2
The mixture of CO and CO2 is bubbled into the alkali (Ca(OH)2) CO2 is acidic and it reacts with Ca(OH)2 which is alkali. In the meantime CO which is neutral will just pass through.
Following of the separation of CO and CO2, what changes would you do to collect both gases ( CO and CO2 ).
- Refer to the procedure. Ca(OH)2 + CO2 –> CaCO3 + H2O
- Filter the CaCO3 after all CO is collected
- Do action of heat. CaCO3 –> CaO + CO2 (CO2 is collected)
