Molecular Formula: CO2
Molecular weight: 44
Principle: When calcium carbonate (marble or limestone) is treated with dilute hydrochloric acid, carbon dioxide is produced.
CaCO3 + 2HCl -----------> CaCl2 + H2O + CO2
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)
______ hydroxide is also known as 'caustic soda'.
The molecular weight of carbondioxide is ______.
When calcium carbonate (marble or limestone) is treated with ______ carbondioxide is formed.
When carbon dioxide dissolves in water, it produces ______.
none of above
When carbon dioxide is heated with red hot coke at 900 celcius, it produces ______.
carbon mono oxide