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DETERMINATION OF FREE CO 2 IN WATER Background Information Carbon dioxide (CO 2) is present naturally as a result of animal respiration, the decay of organic of matter, and the decomposition certain minerals. It is the major source of acidity in polluted water samples. Surface waters typically contain less than 10 ppm (mg/L) dissolved (CO 2),
Contents. Acknowledgement Preface Introduction. Density (kg/m3) of Saturated Carbon Dioxide. Enthalpy (J/mol) of Saturated Carbon Dioxide. Entropy (J/mol ·Κ) of Saturated Carbon Dioxide. Heat Capacity, C,, (J/mol · K) of Saturated Carbon Dioxide. Density (kg/m3) of Carbon Dioxide as a Function of Temperature and Pressure.
Example: Pure water in contact with atmosphere [H+] = K 1K HP CO2/[H +] + 2K 1K 2K HP CO2/[H +]2 + K w/[H +] Can solve rigorously for [H+]. Alternatively, make a simplifying assumption: [CO 3 2-] << [HCO 3-] In this case: [H+] = K 1K HP CO2/[H +] + K w/[H +] or [H+]2 = K 1K HP CO2 + K w This is easily solved: For pure water @25°C: K 1 = 4.45 x ...
The solubility of CO2 in water, expressed as mole fraction of CO2 in the liquid phase, is given for pressures up to atmospheric and temperatures of 0 to 100 °C. Note that 1 standard atmosphere equals 101.325 kPa. The references give data over a wider range of temperature and pressure. The estimated uncertainty is about 2%.
15 cze 2003 · The solubility of CO 2 in water is modelled according to the following reaction equilibrium: (1) CO 2(vap, liq) = CO 2(aq), where CO 2(vap,liq) stands for carbon dioxide in the CO 2-rich vapour or liquid phase, and CO 2(aq) denotes all aqueous species of CO 2 lumped together.
Introduction. When carbon dioxide gas dissolves in water, it forms a weakly acidic solution due to the following reversible reaction: 2CO2(g) + H2O(l) → CO2(aq) + H+(aq) + HCO3–(aq) Equation 1. The hydrogen ion concentration in solution depends on the amount of dissolved carbon dioxide.
I. INTRODUCTION . A knowledge of the polarizability and the dielec tric permeability as functions of the frequency of the electric field, i. e., the dispersion law, is re quired in many theories of intermolecular forces. London1,2 expresses the intermolecular forces in terms of the polarizabilities in two different for mulations: 1.
