Solubilities of Bromide Salts of Aluminum, Cobalt, Lead, Manganese, Potassium, and Sodium When Sparged With Hydrogen Bromide.
The effects of hbr concentration and temperature on the solubility and hydration state of albr3, cob, pbbr2, mnbr2, kbr, and nabr were investigated by the Bureau of Mines. Saturated aqueous solutions of the al, pb, k, and na bromides were sparged with hbr gas at 20 deg, 40 deg, and 60 deg c, and saturated solutions of CO and mn bromides were sparged at 20 deg c. Increased hbr concentration caused decreased salt solubility because of the common ion effect for all the investigated bromides except pbbr2. Aqueous solubilities at 20 deg c were, in percent, 51.7 For albr3, 53.2 For cobr2, 1.1 For pbbr2, 59.6 For mnbr2, 39.5 For kbr, and 47.4 For nabr. At 60 deg c, the solubilities were, in percent, 53.3 For albr3, 2.2 For pbbr2, 46.0 For kbr, and 53.8 For nabr. Solubilities in solutions sparged to hbr saturation at 20 deg c were, in percent, 0.5 For albr3, 42.0 For cobr2, 32.2 For pbbr2, 21.0 For mnbr2, 0.6 For kbr, and 0.3 For nabr. At 60 deg c, the solubilities at hbr saturation were, in percent, 1.8 For albr3, 41.4 For pbbr2, 1.3 For kbr, and 0.4 For nabr, cobr, precipitated out to a minimum solubility of 27.2 pct at 28.7-Pct-hbr concentration. Further increases in hbr concentration increased cobr2 solubility because of the formation of bromide complexes. PBbr2 increased in solubility as hbr concentration increased.