What is the concentration of ions in the soil solution after fertilizer application? Suppose that 122 pounds of K+ were applied per acre, then a gentle rain soaked the top 10 inches of soil to field capacity, which for the given soil was about 16% water by volume. If the K+ was applied as KCl, it is plausible that it all dissolved and distributed relatively uniformly with the infiltrating water. If so, then what was the K+ concentration in the soil solution in mol K+/L solution? Note that the volume can be computed like we do for an acre-furrow-slice (AFS), as area times depth. This is going to be a relatively small number, so please report your answer in mol K+/L solution to at least 5 decimal places.

18, You are trying to find the equilibrium constant for the reaction At(aq) + B (aq) AB(aq) where the compound AB has a strong absorbance at 520 nm, and the ions do not absorb light at that wavelength. The following data for concentration versus absorbance was collected in a calibration run: [AB] (x 104 M) AB (absorbance) 1.00 0.084 2.00 0.167 3.00 0.251 4.00 0.337 5.00 0.421 In an actual experiment, [A'l = 0.0160 M and [Bl = 0.0100 M. The equilibrium transmittance of the solution was 51.0%. Since the relation between %T (percent transmittance) and A (absorbance) is A=2- log(%T), the absorbance of the solution at equilibrium is about 0.292 Can one use the data to find the equilibrium constant Ke for the reaction? Give a general description of how, if possible, or why not, if not possible.

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