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ICSE Class 6 Answered

How can you show that one - fifth of air is oxygen ???
Asked by Molaypaul700 | 06 Nov, 2018, 10:29: AM
answered-by-expert Expert Answer

Activity: To show that about one-fifth of air is oxygen and the rest four-fifth is nitrogen.

                                            

 i.   Take a trough and place a gas jar stand in it. Fix a candle on the gas jar stand and fill half the trough with water.
 ii.  Light the candle with a matchstick and cover the burning candle by placing an inverted gas jar over it.
iii.  After a short time, the candle stops burning and water rises up in the gas jar to a certain level. The candle gets extinguished because all the oxygen present in air contained in the gas jar was used up by the burning candle.
iv.  When the candle burns, then oxygen of air in the gas is used up and carbon dioxide gas is formed. This carbon dioxide gas (CO2) formed is absorbed by the sodium hydroxide solution present in the trough.
 v.  The absorption of CO2 gas by NaOH solution creates a vacuum in the gas jar. Hence, water rises up in the gas jar to fill this vacuum.
vi.  Water in the gas jar rises to about one-fifth part of the volume of air initially present in the gas jar. The volume of water rise in the gas jar is equal to the volume of oxygen present in the air in the gas jar which was used up during the burning of the candle.
 
 
      Hence, we conclude that about one-fifth of air is oxygen. The major part of the air which is not used up for the burning of a candle and remains behind in the gas jar is nitrogen. Since water does not rise in the remaining four-fifth part of the gas jar, it proves that about four-fifths part of the air is nitrogen.
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