A KCl solution containing 42 g of KCl per 100 g of water is cooled from 60 °C to 0 °C. What happens during cooling?(see Figure 1)
Figure 1 Solubility of some ionic solids as a function of temperature
The solubility of a solid in a solution is dependent on temperature. Thus the solubility of most solids in water increases with increasing temperature.
From the figure 1., it is observed the solubility of KCl at 60 °C is 45 g per 100 g of water whereas the solubility of KCl at 0 °C is 28 g per 100 g of water. Thus, a KCl solution containing 42 g of KCl per 100 g of water is cooled at 60 °C forms unsaturated solution....