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Question
The species present in the solution when CO2 is dissolved in water are:
The species present in the solution when CO2 is dissolved in water are:
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Solution
The correct option is A CO2,H2CO3,HCO−3,CO2−3
CO2 has low solubility in water and forms carbonic acid after reacting with water.
CO2+H2O⇌H2CO3
H2CO3⇌H++HCO−3
HCO−3⇌H++CO2−3
THEORY
Properties:
- CO2 is a colorless and odorless gas.
- CO2 has low solubility in water and forms carbonic acid after reacting with water. H2CO3 is a weak dibasic acid and dissociates in two steps.
H2CO3(aq)+H2O(l)⇌HCO–3(aq)+H3O+(aq)
HCO–3(aq)+H2O(l)⇌CO2–3(aq)+H3O+(aq)
H2CO3/HCO−3 buffer system helps to maintain pH of blood between 7.26 to 7.42. Being acidic in nature, it combines with alkali metals to form metal carbonates.
- Removal from the atmosphere by photosynthesis.
6CO2+12H2Ohν−−−−−−−→ChlorophyllC6H12O6+6O2+6H2O
- It is the process by which green plants convert atmospheric CO2 into carbohydrates such as glucose.
- Plants make food for themselves as well as for animals and human beings through photosynthesis.
- Unlike CO, it is not poisonous. But the increase in combustion of fossil fuels and decomposition of limestone for cement manufacture has increased the CO2 content of the atmosphere.
- This may lead to an increase in the greenhouse effect and thus, raise the temperature of the atmosphere.
Uses of CO2:
1. Gaseous CO2 is extensively used in carbonated soft drinks.
2. Being heavy and non-supporter of combustion, it is used as a fire extinguisher.
3. A substantial amount of CO2 is used to manufacture urea.
4. CO2 produced in solid form as dry ice is used as a refrigerant for frozen foods.
CO2 has low solubility in water and forms carbonic acid after reacting with water.
CO2+H2O⇌H2CO3
H2CO3⇌H++HCO−3
HCO−3⇌H++CO2−3
THEORY
Properties:
- CO2 is a colorless and odorless gas.
- CO2 has low solubility in water and forms carbonic acid after reacting with water. H2CO3 is a weak dibasic acid and dissociates in two steps.
H2CO3(aq)+H2O(l)⇌HCO–3(aq)+H3O+(aq)
HCO–3(aq)+H2O(l)⇌CO2–3(aq)+H3O+(aq)
H2CO3/HCO−3 buffer system helps to maintain pH of blood between 7.26 to 7.42. Being acidic in nature, it combines with alkali metals to form metal carbonates.
- Removal from the atmosphere by photosynthesis.
6CO2+12H2Ohν−−−−−−−→ChlorophyllC6H12O6+6O2+6H2O
- It is the process by which green plants convert atmospheric CO2 into carbohydrates such as glucose.
- Plants make food for themselves as well as for animals and human beings through photosynthesis.
- Unlike CO, it is not poisonous. But the increase in combustion of fossil fuels and decomposition of limestone for cement manufacture has increased the CO2 content of the atmosphere.
- This may lead to an increase in the greenhouse effect and thus, raise the temperature of the atmosphere.
Uses of CO2:
1. Gaseous CO2 is extensively used in carbonated soft drinks.
2. Being heavy and non-supporter of combustion, it is used as a fire extinguisher.
3. A substantial amount of CO2 is used to manufacture urea.
4. CO2 produced in solid form as dry ice is used as a refrigerant for frozen foods.
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