Densities and partial molar volumes are needed to calculate the size of aqueous aerosols, and the Kelvin effect
on equilibrium vapour pressures above very small droplets. On this page we make available models that predict
the volume properties of pure aqueous solutions and liquid mixtures (1, 2). Their characteristics are as follows:

Inputs: temperature, and the
molalities, molarities, or weight percent of each solute species present.

Outputs: density, concentrations and apparent molar volumes of the solutes,
partial molar volumes of both solutes and solvent, and the assumed composition of the solution in terms of
electrolytes (mixtures only).

Methods: follow this link for a summary of the approaches used, and descriptions
of the methods used to predict the properties of mixtures from those of single electrolyte solutions.

References

(1) S. L. Clegg and A. S. Wexler (2011) Densities and apparent molar volumes of atmospherically
important electrolyte solutions. I. The solutes
H_{2}SO_{4}, HNO_{3}, HCl,
Na_{2}SO_{4}, NaNO_{3}, NaCl,
(NH_{4})_{2}SO_{4},
NH_{4}NO_{3}, and NH_{4}Cl
from 0 to 50 °C, including extrapolations to very low temperature and to the pure liquid state,
and NaHSO_{4}, NaOH and NH_{3} at 25 °C.
J. Phys. Chem. A115, 3393-3460.

(2) S. L. Clegg and A. S. Wexler (2011)
Densities and apparent molar volumes of atmospherically important electrolyte solutions. II.
The system H^{+} -
HSO_{4}^{−} -
SO_{4}^{2−} -
H_{2}O from 0 - 3 mol kg^{−1}
as a function of temperature and
H^{+} - NH_{4}^{+} -
HSO_{4}^{−} -
SO_{4}^{2−} -
H_{2}O from 0 - 6 mol kg^{−1}
at 25 °C using a Pitzer ion interation model, and
NH_{4}HSO_{4} - H_{2}O and
(NH_{4})_{3}H(SO_{4})_{2} -
H_{2}O over the entire concentration range. J. Phys.
Chem. A115, 3461-3474.