The data are entered in a series of fields, and options are set using radio buttons or check boxes.
For example, consider a system containing 1.0E-6 moles of H2SO4, and the same amount of HNO3, in 1 m3 at 298.15 K and a fixed RH of 50%. If no HNO3 is allowed to partition into the vapour phase, then at equilibrium the amount of HNO3 in the liquid phase remains at 1.0E-6 mol, and the equilibrium pHNO3 is 0.1125E-3 atm. If partitioning is enabled, then 0.99988E-6 mol of HNO3 resides in the gas phase, at a partial pressure of 0.2408E-7 atm. The default is that partitioning is enabled. Check the boxes to prevent partitioning for each trace gas, as required.