The salicylic acid’s appearance are pure, fine, off-white needles. The copper sulfate penetrated ‘s appearance first observing are contaminated, white coat outside blue crystals.
Prefab question: 1 . Explain briefly why Cuscus is more soluble in water than in an organic (monopole) solvent. Why is the reverse true for salicylic acid? As the rule of thumb says “like dissolve like” : Cuscus is a polar substance, therefore, it is more soluble in polar solvent (water is a polar solvent) than in monopole solvent.Salicylic acid is a monopole substance, Hereford, it is less soluble in polar solvent (water is a polar solvent) than in monopole solvent (such as gasoline). 2.
Suggest reasons why the solubility of most solid substances in liquid solvents increases with temperature, whereas the solubility of gases decreases with temperature. As the temperature is increasing: The particles in solid substances, which are normally in fixed positions and close together, become more active and free to move so it increases the chance for particles in liquid solvents to contact to the particles in solid substances.Therefore, the solubility of most solid substances in liquid solvents increases with temperature. The particles in gases, which normally have complete freedom of motion and are far apart, become more disordered and move faster so it decreases the chance for particles in liquid solvents to contact to the particles in gases. Therefore, the solubility of gases decreases with temperature. 3.
E. D. Student used 2. Egg of a mixture of copper sulfate penetrated and salicylic acid in the performance of this experiment. E.
D. Recovered 1. Egg of salicylic acid and 1. G of copper sulfate penetrated. What is wrong with DE. ‘s results? How might this error have been avoided? In E. D. ‘s results, the total mass of separate substances he recovered, 2.
Egg, is 0. Egg higher than the mass of the original mixture, 2. Egg. His recovered substances may be contaminated. The mass of the copper sulfate penetrated he weighed may be including the mass of ethanol.
To avoid this error, we should wait for a while for the ethanol to evaporate completely then weigh the copper sulfate penetrated again. Discussion:We did experiment to separating the mixture of Salicylic Acid and Cuscus. UH successfully.
At the first filtration, we recovered the pure salicylic acid crystal and weighed it easily. At the second filtration, we recovered the contaminated copper sulfate penetrated ( observe the white coat outside the blue crystals) so it takes longer time to wait for the ethanol to evaporate then we can weigh the crystals. We calculated the percent of recovered salicylic acid and copper sulfate penetrated . The percent of original sample not recovered is small.