Introduction: Fractional crystallization is one of the experimental techniques used to separate or purify mixture. Fractional crystallization makes use of the differences of solubility to separate the components of a mixture. Goals: Applying fractional crystallization to separate a mixture of salicylic acid and copper sulfate pentahydrate into its components. Calculate the percent of salicylic acid and copper sulfate pentahy- drate in the mixture. Procedure: Block/McKelvy/with contributions from Georgia Perimeter Faculty (2012) – Laboratory Experiments for Chem 1211L & 1212L Cengage Learning (7th ed.
) p. 23&24 (Separation of a mixture into its components by fractional crystallization) Data and result: Unknown number9 Mass of unknown + beaker69. 1607 g Mass of beaker66. 6636 g Mass of unknown mixture2. 4971 g Salicylic Acid Crystallization Mass of weighing paper + Salicylic acid1. 7468 g Mass of weighing paper0. 9446 g Mass of Salicylic Acid0. 8022 g Calculation of percent salicylic Acid32. 13 % in original mixture: % salicylic acid = (m Salicylic Acid : m unknown mixture) x 100% = (0. 8022 : 2. 4971) x 100% = 32. 13% CuSO4. 5H2O Crystallization
Mass of weighing paper + CuSO4. 5H2O2. 6484 g Mass of weighing paper1. 0127 g Mass of CuSO4. 5H2O1. 6357 g Calculation of percent CuSO4. 5H2O65. 504% in original mixture: % CuSO4. 5H2O = (m CuSO4. 5H2O : m unknown mixture) x 100% = (1. 6357 : 2. 4971) x 100% = 65. 504% Percent of original sample not recovered 100% – ( 32. 13% +65. 504%) = 2. 37% Comments concerning appearance and purity: The salicylic acid’s appearance are pure, fine, off-white needles. The copper sulfate pentahydrate ’s appearance first observing are contaminated, white coat outside blue crystals.
The Essay on Surface Area Mass Acid Limestone
An Experiment To Investigate If Particle Size Affects The Amount Of Carbon Dioxide Produced Hypothesis I think that the smaller limestone chips will produce the greater amount of carbon dioxide than the larger chips as there will be a greater surface area for the acid to react upon. This is because the greater the surface area the higher the amount of collisions between limestone and acid ...
Prelab question: 1. Explain briefly why CuSO4 is more soluble in water than in an organic (nonpolar) solvent. Why is the reverse true for salicylic acid? As the rule of thumb says “like dissolve like” : CuSO4 is a polar substance, therefore, it is more soluble in polar solvent (water is a polar solvent) than in nonpolar solvent. Salicylic acid is a nonpolar substance, therefore, it is less soluble in polar solvent (water is a polar solvent) than in nonpolar 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. 498g of a mixture of copper sulfate pentahydrate and salicylic acid in the performance of this experiment. E. D. recovered 1. 184g of salicylic acid and 1. 367g of copper sulfate pentahydrate.
The Essay on Rate Of Reaction Acid Temperature Particles
How does temperature affect the rate of reaction between Hydrochloric acid and marble chips? Aim From this investigation, we intend to find out if the temperature of acid, in this case Hydrochloric acid, affects the rate of reaction between itself and marble chips. Hypothesis We expect to find that the higher the temperature of acid, the quicker the rate of reaction. The rate of reaction will ...
What is wrong with E. D. ’s results? How might this error have been avoided? In E. D. ’s results, the total mass of separate substances he recovered, 2. 551g, is 0. 053g higher than the mass of the original mixture, 2. 498g. His recovered substances may be contaminated. The mass of the copper sulfate pentahydrate 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 pentahydrate again. Discussion:
We did experiment to separating the mixture of Salicylic Acid and CuSO4. 5H2O 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 pentahydrate ( 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 pentahydrate . The percent of original sample not recovered is small.
