WHY IS CARBON PRESENT EVERYWHERE? WHAT IS CARBON CYCLE

Asked by Rajpreet Srivastav | 3rd Dec, 2013, 08:30: PM

Expert Answer:

Carbon cycle

The various processes by which the percentage proportion of carbon dioxide, CO2 in the atmosphere is kept constant constitute the carbon cycle. About 0.03% to 0.04% of carbon dioxide is present in the atmosphere.

  • Carbon dioxide is produced in industries by heating of carbonates and bicarbonates and also by reacting carbonates and bicarbonates with acids.

Carbonates:

CaCO3(s) CaO(s) + CO2(g)

Bicarbonates:

2KHCO3(s) K2CO3(s) + H2O(g) + CO2(g)

Removal of carbon dioxide:

Carbon dioxide is used in the process of photosynthesis and is also absorbed by water, alkalis and limewater.

2KOH + CO2 → K2CO3 + H2O
Ca(OH)2 + CO2 → CaCO3 + H2O
                                 (Milky)

Ca CO3 + CO2 + H2O → Ca(HCO3)2

Answered by Hanisha Vyas | 4th Dec, 2013, 11:13: AM

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