Question: For this question, you can assume that activities equal concentrations, i.e. that g = 1 for all species. Values of K: 20C 10C K CO
For this question, you can assume that activities equal concentrations, i.e. that g = 1 for all species. Values of K:
20C 10C
KCO2 (Henry's Law constant) 10-1.41 10-1.27 KH,CO2 = [H2CO3]/PCO2
Ksp,calcite 10-8.45 10-8.41 Ksp,calcite = [Ca2+].[CO32-]
K1(H2CO3) 10-6.38 10-6.46 K1 = [H+].[HCO3-]/[H2CO3]
K2(H2CO3) 10-10.38 10-10.49 K2 = [H+].[CO32-]/[HCO3-]
(a) What are the pH and calcium concentration (in moles/L) of a water in equilibrium with calcite at a PCO2 of 10-2.0 atm at 20C?
(b) What are the pH and calcium concentration (in moles/L) of a water in equilibrium with calcite at a PCO2 of 10-2.0 atm at 10C?
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