## Abstract

The densities of KCl and K_{2}SO_{4} were measured from dilute solutions to saturation from 5 to 95°C. The data were combined with literature data to produce density and apparent molal volume, V_{φ}, equations from 0 to 100°C and to saturation. The standard deviations of the density equations were 30×10^{-6} g-cm^{-3} and 32×10^{-6} g-cm^{-3}, respectively, for KCl and K_{2}SO_{4}. Pitzer equations were used to fit the V_{φ} data. The resulting infinite dilute partial molal volumes, V^{o}, were in reasonable agreement with literature data. The densities of the mixtures of the six combinations of the salts KCL, K_{2}SO_{4} NaCl and Na_{2}SO_{4} were measured at I=2.0 and t=5, 25, 55 and 95°C. The resulting volumes of mixing were fitted to equations of the form {Mathematical expression} where v_{ 0} and v_{ 1} are interaction parameters. The cross square rule is valid over the entire temperature range although the deviations are larger at higher temperatures. Pitzer θ_{ NaK}^{ v} and {Mathematical expression} parameters were determined from the common ion mixtures. The values of θ_{ NaK}^{ v} were small and not strongly dependent upon temperature. The values of {Mathematical expression} were also small and changed considerably with temperature.

Original language | English (US) |
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Pages (from-to) | 353-374 |

Number of pages | 22 |

Journal | Journal of Solution Chemistry |

Volume | 19 |

Issue number | 4 |

DOIs | |

State | Published - Apr 1 1990 |

## Keywords

- Densities
- KCl
- KSO
- Pitzer theory
- partial molal volumes

## ASJC Scopus subject areas

- Biophysics
- Biochemistry
- Molecular Biology
- Physical and Theoretical Chemistry