Carbon Dioxide



Physical properties of carbon dioxide

Carbon dioxide is a colourless odourless gas, is soluble in water, in ethanol and in acetone, has melting point of -55.6 C, has boiling point of -78.5 and has density 1.977g/ml.


Chemical properties of carbon dioxide

Carbon dioxide is an acidic oxide and reacts with water to give carbonic acid. Carbon dioxide reacts with alkalis to give carbonates and bicarbonates.


Uses of carbon dioxide

1.Large quantities of solid carbon dioxide (i.e. in the form of dry ice) are used in processes requiring large scale refrigeration. 
2. Carbon dioxide is also used in fire extinguishers as a desirable alternative to water for most fires.
3. It is a constituent of medical gases as it promotes exhalation. It is also used in carbonated drinks.


Method of prepration of Carbon dioxide

1. It is prepared by complete combustion of carbon and carbon containing fuels in excess of air.
2.It is prepared in the laboratory by the action of dilute HCl on calcium carbonate.


Properties and uses of dry ice

1. Dry ice is comprising two oxygen atoms bonded to a single carbon atom.

2.  It is colorless, with a sour zesty odor, non-flammable, and slightly acidic.

3.  At pressures below 5.13 atm and temperatures below 56.4 C (69.5 F) changes from a solid to a gas with no intervening liquid form, through a process called sublimation. 

4. The opposite process is called deposition, where changes from the gas.