Leveratory preparation of carbon dioxide gas, its taste, properties and usage. In laboratory, carbon dioxide gas can be prepared by the action of dilute hydroploric acid on marble chips. The chemical reaction can be shown as calcium carbonate plus hydropluric acid gives calcium chloride, water and carbon dioxide. The carbon dioxide gas is collected by upward displacement of air because it is heavier than here. An apparatus chemical is required for this is shown in the diagram. We can confirm the prepared gas is carbon dioxide when we add or keep the most blue it must be put in the gas jar, it turns into red color. We can test carbon dioxide as a when carbon dioxide gas pass through the lime water, its turn milky color or lime water turn into quadi color. It is due to formation of insoluble calcium carbonate. We can confirm that the prepared gas is carbon dioxide when burning majesty, kept near the gas jar containing carbon dioxide it blew off. Carbon dioxide gas fill the balloon, fall downward or move downward in atmosphere. It is lighter, it is heavier than here, about 60% denser than here. Mostly it is naturally get collected in cave in tunnel pool well. When carbon dioxide dissolve in water it gives carbonic acid. It is get dissolved in water and from carbonic acid the reaction can be shown as carbon dioxide plus water gives carbonic acid. When carbon dioxide gets pass through lime water it turns into milky color for short time. And the reaction is calcium hydroxide plus carbon dioxide gives calcium carbonate and water. That calcium carbonate is insoluble white substance and lime water seems milky color. For long time when carbon dioxide gas pass through the lime water then the milky color gets disappeared. Because carbon dioxide react with water and calcium carbonate that gives insoluble calcium by carbonate. When carbon dioxide gas heated with ammonia gas gives you the carbon dioxide plus ammonia gives you the water. When uses of carbon dioxide gas plant use carbon dioxide and water for photosynthesis or food making process. Lips contain chlorophyll which convert carbon dioxide and water in presence of sunlight into sugar and oxygen. Carbon dioxide gas is used in manufacturing of urea which is nitrogen rich chemical fertilizer needed for growth and development of plant. When carbon dioxide is cooled about minus seventy-eight degree Celsius it changes to dry ice. Dry ice is used in cold storage as a cooling agent or in a dry cleaning of clothes. 5th week. Carbon dioxide is heavier than air they are put it cover fire surface and used in fire extinguisers to extinguish fire. It cover fire surface and prevent supply of oxygen. We know that oxygen is most necessary for burning and it disconnects supply of oxygen. Carbon dioxide gas used in soda water. When it dissolves water from carbonic acid and that aeronated drinks contains carbon dioxide dissolve in it.