The solubility of ammonium formate,NH4HCO2 , in 100. g of water is 102 g at 0 °C and 546 g at 80 °C. A solution is prepared by dissolving NH4HCO2 in 185 g of water until no more will dissolve at 80 °C. The solution is then cooled to 0 °C. What mass of NH4HCO2 precipitates? (Assume that no water evaporates and that the solution is not supersaturated.)

The solubility of ammonium formate, NH4CHO2, in 100g. of water is 102 g at 0 degrees celsius and 546g at 80 degrees celsius. A solution is prepared by dissolving NH4CHO2 in 200 g of water until no more will dissolve at 80 degrees. the solution is then cooled to 0 degrees. What mass of NH4CHO2 precipitates assuming no water evaporates and the solution is not supersaturated?

The solubility of a substance is 60 g per 100 mL of water at 15°C. A solution of this substance is prepared by dissolving 75 g in 100 mL of water at 75°C. The solution is then cooled slowly to 15°C without any solid separating. The solution is

(a) supersaturated at 75°C
(b) supersaturated at 15°C
(c) unsaturated at 15°C
(d) saturated at 15°C