Write method of preparation, properties and uses of carbondioxide
Answers
METHOD OF PREPARATION.
general methods of preparation are
1. burning of charcoal or carbon or coke
2. thermal decomposition of metal carbonates
3. thermal decomposition of bicarbonates
4. action of dilute mineral acids on carbonates and bicarbonates
Laboratory method of preparation
principle.
marble chips contain calcium carbonate which on the addition of dilute hydrochloric acid releases carbon dioxide gas.
process.
marble chips are taken in a conical flask. a two holed rubber cork is introduced into this. through one hole a thistle funnel is inserted and through another hole a delivery tube is inserted. dilute hydrochloric acid is added dropwise through the thistle funnel. carbon dioxide gas was generated during the reaction comes out through the delivery tube.
Collection of gas.
it can be collected by the upward displacement of air since it is heavier than air.
PROPERTIES.
physical properties.
1. colourless
2. no characteristic smell
3. heavier than air
4. highly soluble in water
5. acidic
6. not poisnous
chemical properties.
1.non combustible
2. not a supporter of combustion
3. neutralistion occurs with the formation of salt and water
4. turns milky
5. no reaction with oxygen
6. oxidizes carbon to carbon monoxide
USES..
1. HARDENING OF MOTARS.
2. carbogen is used to stimulate respiratory problems.
3.used in soft drinks or aerated drinks
4. dry ice is used as a refrigerant
5. production of industrial compounds
6. preservation of food grains
7. fire extinguishers
8.aeration of dough.