Model IV:  H+ - NH4+ - Na+ - SO42− - NO3 - Cl - H2O

   1.  Simple (this page)            6.  Parametric, varying: (a) temperature
   2.  Comprehensive (b) relative humidity, or total water
   3.  Aqueous solution (c) lapse rate
   4.  Batch (d) chemical composition
   5.  Köhler curves

Simple Calculation

Here, the model determines the state of a system containing water, and two or more ions, at equilibrium with an atmosphere of known temperature and relative humidity. Solids are allowed to form, at the choice of the user, but partitioning of trace gases into the vapour phase is not enabled. Specify the problem in the input fields below.

Ambient Conditions

Temperature (180 - 330 K):     Relative Humidity (0.1 - 1.0):

(See inputs for details of restrictions on the temperature range, related to the chemical composition of the system.)

If the temperature is less than 273.15 K, and you wish the system to be equilibrated to the water vapour pressure over ice, then check the box here. (Any relative humidity that has been entered above will be ignored.)

Ionic Composition in Moles

H+:      NH4+:     Na+:
SO42:      NO3:     Cl:

Other Chemical Components

The amounts of organic compounds present can be entered here. First, click the button to select compounds from the library or create new ones for this session.

Solid Phases

Check the boxes below to prevent the formation of selected solids, according to the restrictions that apply for this model. This enables the properties of metastable, supersaturated, aqueous aerosols to be investigated. The default for each calculation is that all solids can form.

No boxes should be checked for any systems containing both NH4+ and Cl ions.

Omit the following solids:

Ice H2SO4 · H2O H2SO4 · 2H2O
H2SO4 · 3H2O H2SO4 · 4H2O H2SO4 · 6.5H2O
HNO3 · H2O HNO3 · 2H2O HNO3 · 3H2O
HCl · 3H2O (NH4)2SO4 (NH4)3H(SO4)2
NH4HSO4 NH4NO3 2NH4NO3 · (NH4)2SO4
3NH4NO3 · (NH4)2SO4

To submit your calculation, click here: