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Note on Carbondioxide

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Molecular Formula: CO2

Molecular weight: 44

Molecular structure:

http://www.kullabs.com/js/ckfinder/userfiles/images/1.JPG

 

Laboratory preparation

Principle: When calcium carbonate (marble or limestone) is treated with dilute hydrochloric acid, carbon dioxide is produced.

http://www.kullabs.com/js/ckfinder/userfiles/images/2.JPG

CaCO3 + 2HCl -----------> CaCl2 + H2O + CO2

 

Precautions

 

  1. The carbon dioxide gas should be collected by the upward displacement of air.
  2. The apparatus must be made airtight.
  3. The end of the thistle funnel should be dipped in the acid of the round bottom flask.
  4. The end of the delivery tube should not touch the acid inside the round bottom flask

  • When calcium carbonate (marble or limestone) is treated with dilute hydrochloric acid, carbon dioxide is produced. CaCO3 + 2HCl→ CaCl2 + H2O + CO2
  • The carbon dioxide gas should be collected by the upward displacement of air.
  • Carbon Dioxide is used to manufacture of soda water, coca cola and other soft drinks.
  • Carbon Dioxide is also used as a refrigerant for preserving food or cooling agent in the refrigerator.
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Very Short Questions

Carbon dioxide is heavier than air. So, it occupies the bottom layer in the atmosphere. likewise, within the gas jar it occupies bottom. Hence, it is collected by upward displacement of air.

Carbon dioxide is not collected in a jar containing water because it is soluble in water and forms carbonic acid (H2CO3).

The solid form of carbon dioxide is called dry ice. As carbon dioxide is cooled at -78 o C, it changes into dry ice. It acts as a refrigerant for preserving foods.

When a burning magnesium is introduced into the gas jar containing carbon dioxide gas white precipitation is formed along with black spot of carbon.
2Mg + CO2 → 2MgO + C

Slaked-lime is an anhydrous form of lime. But, lime-water is a hydrated form of lime. When slaked lime is mixed with water lime-water is obtained.

CaO (s) + H2O (l)→Ca (OH)2 (aq)

0%
  • ______ hydroxide is also known as 'caustic soda'.

    sodium
    magnesium
    potassium
    calcium
  • The molecular weight of carbondioxide is ______.

    44


    56


    47


    50


  • When calcium carbonate (marble or limestone)  is treated with ______ carbondioxide is formed.

    dilute KOH
    dilute HCl
    concentrated HCl
    All the answers are correct
  • When carbon dioxide dissolves in water, it produces ______.

    hydrochloric acid


    carbonic acid


    none of above


    sulphuric acid


  • When carbon dioxide is heated with red hot coke at 900 celcius, it produces ______.

    carbonic acid


    carbon mono oxide


    forms nothing


    doesnot react


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DISCUSSIONS ABOUT THIS NOTE

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Sujata

I didn't get about the figure nicely


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why do we spread water in our body before going underground?

no


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How do you know whether the jas is full or not


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