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Fundamentals Of Analytical Chemistry

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.20QAP

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Under a 25°C subsurface environment, the groundwater has reached equilibrium with
soil minerals and pore gas. The pH of groundwater equals to 7.4. The major component
of soil minerals is CACO3, with solubility constant pKso = 8.3. The partial pressure of
CO2 in the pore gas is 0.2 atm. Determine [H2CO;], [HCO;], [CO;], [Ca?"]. Give your
%3D
answers in molar concentration (M).
Hints:
Acid constants of H2CO3 at 25°C: pKal = 6.3; pKa2 = 10.3
Henry's constant for CO2 at 25°C: KH = 3.39*102 M/atm
%3D

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