The following data are available for the solubility of barium sulfate in water: 

where values for the parameter α for water are given in Table 9.10-1.

a. Compute K°_s , the ideal solution solubility product, for barium sulfate at each of the temperatures in the table.

b. At each of the temperatures in the table calculate the Gibbs energy change for the reaction 

Here (s) denotes the pure solid state, and (aq, M = 1, ideal) indicates the ion in a hypothetical ideal aqueous solution at 1-molal concentration. 

c. Compute the entropy and enthalpy changes for the reaction in part (b) at 5°C, 15°C, and 25°C.

Transcribed Image Text:

Temperature (°C) Solubility (mol m-³) Temperature (°C) Solubility (mol m ³) 5 0.0156 20 0.0198 10 0.0167 25 0.0216 15 0.0183 The mean activity coefficient + for ions of a salt at low ionic strength is given by In y = -a|z+z-|√I