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2. What is the PCO2 and CO3 (aq) concentration of a 5 °C ground water sample with pH= 6.5, and 50 mg L HCO; (aq)? 3. In 1960
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Answer #1

Question 4.

The equilibrium for the solubility of CO2(g) can be written as follows.

CO2(g) + H2O(l) <----> CO2(aq); \DeltaH is negative.

The above process is exothermic.

Hence, according to Le-Chatelier's principle, low temperatures are favorable for the above equilibrium.

i.e. The solubility of CO2 decreases by increasing temperature.

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