Table 3. Summary of the Thermodynamic Values of Solubility Reactions at 298.15 Ka.
| gypsum | anhydrite | hemihydrate | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| model | ΔG° | ΔS° | ΔH° | ΔCp | ΔG° | ΔS° | ΔH° | ΔCp | ΔG° | ΔS° | ΔH° | ΔCp | 
| model D7 | 26 372 | –95 | –1814 | –213 | 25 644 | –132 | –13 774 | –325 | 23 164 | –131 | –15 840 | –262 | 
| set-0 | 26 392 | –95 | –2063 | –204 | 25 549 | –135 | –14 753 | –312 | 23 101 | –134 | –16 951 | –250 | 
| set-1 | 26 394 | –95 | –2007 | –207 | 25 523 | –136 | –15 158 | –309 | 23 100 | –135 | –17 152 | –247 | 
| set-2 | 26 353 | –94 | –1685 | –227 | 25 472 | –138 | –15 672 | –297 | 23 125 | –135 | –17 128 | –246 | 
| set-3 | 26 428 | –95 | –1968 | –195 | 25 560 | –135 | –14 636 | –309 | 23 114 | –133 | –16 555 | –255 | 
| set-4 | 26 416 | –94 | –1741 | –201 | 25 606 | –130 | –13 291 | –341 | 23 096 | –134 | –16 918 | –251 | 
| set-5 | 26 360 | –96 | –2224 | –205 | 25 496 | –137 | –15 306 | –303 | 22 985 | –137 | –17 950 | –240 | 
| set-6 | 26 797 | –114 | –7080 | –204 | 26 005 | –153 | –19 565 | –240 | 24 102 | –151 | –20 948 | –189 | 
| HSC 953 | 26 518 | –92 | –1716 | 24 460 | –144 | –18 577 | 21 195 | –133 | –18 525 | |||
| NBS54 | 24 893 | –87 | –1130 | 23 662 | –140 | –17 990 | 20 051 | –129 | –18 275 | |||
| CODATA55 | 26 140 | –91 | –1130 | 25 223 | –140 | –17 990 | ||||||
ΔG° and ΔH°, J/mol; ΔS° and ΔCp, J/(mol·K). Clearly deviating values are indicated in bold.