A KCl solution containing 42g of KCl per 100.0 g of water is cooled from 60 C to 0 C . What will happen during cooling?
During the cooling process, several things will happen to the KCl solution:
1. The temperature of the solution will decrease: The initial temperature of the solution is 60°C, and it will be cooled to 0°C. As the solution loses heat energy, the average kinetic energy of the KCl particles will decrease, resulting in a decrease in temperature.
2. Crystallization of KCl: As the temperature decreases, the solubility of KCl in water will also decrease. At a certain point, the KCl molecules will no longer be able to remain dissolved in the water and will start to form solid crystals. This process is known as crystallization.
3. Separation of solid KCl: The solid KCl crystals will separate from the liquid solution. You will observe the formation of solid crystals at the bottom of the container or suspended in the liquid.
4. Increase in concentration: As the water in the solution freezes and forms ice crystals, the concentration of KCl in the remaining liquid part will increase. This is because the solid crystals of KCl do not contain any water, so the remaining liquid part will have a higher concentration of KCl.
Overall, during the cooling process, the KCl solution will go through a phase change from a liquid to a mixture of solid crystals and liquid solution. The concentration of KCl in the liquid part will increase due to the removal of water molecules as ice forms.