Resolution of Matter into Pure Substances II: Fractional Crystallization Answer Key

Resolution of Matter into Pure Substances, II: Fractional CrystallizationData and calculationsRecord the measured masses of the 150-mL beaker, 50-mL beaker, SiC filter paper, and KNO3 filter paper.Separation of SiC1. Calculate the mass of the original sample from the mass of the sample plus the 150-mL beaker.2. Calculate the mass of SiC from the mass of SiC plus filter paper.3. Calculate the percentage by mass of SiC in the original sample.Separation and purity analysis of KNO34. Calculate the mass of recovered KNO3 from the mass of the 150-mL beaker plus KNO3.5. Calculate the percentage by mass of the sample recovered as KNO3.6. Calculate the mass of KNO3 used in the color-comparison analysis.7. Use the Cu(NH3)4^2+ standards to estimate the percentage by mass of CuSO4·5H2O in the recovered KNO3.Recrystallization8. Calculate the mass of purified KNO3 from the mass of filter paper plus purified KNO3.9. Repeat the copper-impurity comparison for the purified KNO3 and compare recovery with purity.Advance Study AssignmentAt 100 °C, the graph shows that 180 g CuSO4·5H2O or 240 g KNO3 dissolves in 100 g water.1. Calculate the water required to dissolve 3.9 g CuSO4·5H2O and 37 g KNO3 at 100 °C. How much water is required for the mixture under the exercise's independent-solubility assumption?2. Add 12 g water to that solution and cool it to 0 °C. At 0 °C, 10. g KNO3 and 20. g CuSO4·5H2O dissolve per 100 g water. Calculate the mass of each solute that remains dissolved, the mass that crystallizes, and the percentage recovery of KNO3.