By Marcel van der Perk
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Extra resources for Soil and Water Contamination: from molecular to catchment scale
As noted earlier, some compounds dissolve in water as molecules, whereas electrolyte minerals dissociate and dissolve as ions. 43) where M = the cation with charge m+ and A = the anion with charge a-, and x and y refer to the stoichiometric constants. In an aqueous solution in contact with an excess of an undissolved, solid, mineral, the mineral will dissolve until the solution is saturated and no more solid can dissolve. The concentration of the saturated solution at a given temperature and pressure is termed the solubility of the substance.
E. 42) where A0 = the initial concentration (activity) of A at t = 0. e. the concentration decreases with time and goes to zero in the limit. 8 Reaction order Consider the decomposition of N2O5: 2N2O5 → 4NO2 + O2 The rate law for this reaction is rate = -k [N2O5] Thus, the reaction is first-order with respect to the N2O5 concentration. 062 s-1, calculate the time needed to lower the initial concentration by 90 percent. 1 s to decrease the N2O5 concentration to 10 percent of its initial value. 7 DISSOLUTIONPRECIPITATION REACTIONS Dissolution and precipitation reactions are an important control on the transition of chemicals between the solid and dissolved phases.
39a), the reaction order is thus equal to α + β. The exponents and the reaction order need to be derived experimentally. e. 40) dt where k = the first-order reaction rate constant [T-1]. e. 42) where A0 = the initial concentration (activity) of A at t = 0. e. the concentration decreases with time and goes to zero in the limit. 8 Reaction order Consider the decomposition of N2O5: 2N2O5 → 4NO2 + O2 The rate law for this reaction is rate = -k [N2O5] Thus, the reaction is first-order with respect to the N2O5 concentration.