4. Explain how calcareous waters which are in contact with atmospheric carbon dioxide have a nearly...

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4. Explain how calcareous waters which are in contact with atmospheric carbon dioxide have a nearly neutral pH. Refer to spec

science chemistry

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Answer 1

Answer #1

we have , following equilibrium of CO2 with water :

CO2(g) <===> CO2 (aq) <===> H2CO3 (aq)

H2CO3 (aq) <===> H+ (aq) + HCO3- (aq) ..... 1

This acidity ( H+ (aq) ) produced due to CO2 equilibrium is neutralized by carbonate-buffer system of calcareous water :

CaCO3 (s) <===> Ca2+ (aq) + CO32- (aq)

CO32- (aq) + H2O (l) <===> OH- (aq) + HCO3- (aq) .... 2

this alkalinty neutralizes acidity arisen due to atmospheric CO2 :

from 1 &2 :

OH- (aq) +H+ (aq) <====> H2O (l)

This pH of water remains neutral.

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Answer 2

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