1c.) Match what you think might happen: Crystals of KNO3 that cool quickly Crystals of KNO3 that cool slowly ...will be
Posted: Sun May 22, 2022 3:36 pm
1c.) Match what you think might happen:
Crystals of KNO3 that cool quickly
Crystals of KNO3 that cool slowly
...will be smaller in size but higher yield
....will be larger in size but lower yield
Experiment 1: Crystallisation of KNO; - thermodynamics vs kinetics In this experiment, a beaker with a pre-weighed (-15 B) of potassium nitrate solid (KNO) will be mixed with 25 ml of water, at a temperature > 60*C. Figure 1 shows the solubility curve for potassium nitrate (KNO.) solution as a function of temperature, which tells us the maximum mass of KNO, that can be dissolved in 100 g water, as a function of temperature. Figure 1: Solubility curve for aqueous KNO, Solubility Curve for KNO3 150 140 130 saturated supersaturated 120 110 100 "saturated 90 Solubility (grams of solute/100g H20) 80 70 60 50 unsaturated 40 30 20 10 0 10 20 60 70 80 90 100 30 40 50 Temperature (°C)
Crystals of KNO3 that cool quickly
Crystals of KNO3 that cool slowly
...will be smaller in size but higher yield
....will be larger in size but lower yield
Experiment 1: Crystallisation of KNO; - thermodynamics vs kinetics In this experiment, a beaker with a pre-weighed (-15 B) of potassium nitrate solid (KNO) will be mixed with 25 ml of water, at a temperature > 60*C. Figure 1 shows the solubility curve for potassium nitrate (KNO.) solution as a function of temperature, which tells us the maximum mass of KNO, that can be dissolved in 100 g water, as a function of temperature. Figure 1: Solubility curve for aqueous KNO, Solubility Curve for KNO3 150 140 130 saturated supersaturated 120 110 100 "saturated 90 Solubility (grams of solute/100g H20) 80 70 60 50 unsaturated 40 30 20 10 0 10 20 60 70 80 90 100 30 40 50 Temperature (°C)