ex4: Example 4-Evaporation and Homogeneous Redox Reactions

Description Source References See Also Examples


Evaporation is accomplished by removing water from the chemical system. Water can be removed by several methods: (1) water can be specified as an irreversible reactant with a negative reaction coefficient in the REACTION keyword input, (2) the solution can be mixed with pure water which is given a negative mixing fraction in MIX, or (3) "H2O" can be specified as the alternative reaction in EQUILIBRIUM_PHASES keyword input, in which case water is removed or added to the aqueous phase to attain equilibrium with a specified phase. This example uses the first method; the REACTION data block is used to simulate concentration of rainwater by approximately 20-fold by removing 95 percent of the water. The resulting solution contains only about 0.05 kg of water. In a subsequent simulation, the MIX keyword is used to generate a solution that has the same concentrations as the evaporated solution, but has a total mass of water of approximately 1 kg. The example can be run using the phrRunString routine.





See Also

Other Examples: ex10, ex11, ex12, ex13a, ex14, ex15, ex16, ex17, ex18, ex19, ex1, ex20a, ex21, ex22, ex2, ex3, ex5, ex6, ex7, ex8, ex9



phreeqc documentation built on July 1, 2020, 11:46 p.m.