Lab Report Separation Of Mixtures
Chem 1211L
Mrs. Amy Cook
February, 9 2011
Lab report on separation of mixtures
Purpose- The purpose of this lab is to separate or isolate the desired product from large amounts of solvent and by-products. It is also followed by a purification step that removes trace amounts of other substances from the final product. One of the experimental techniques that we used in the lab to separate or purify mixture is fractional crystallization. In the experiment we used fractional crystallization to resolve a mixture of salicylic acid and CUSO₄ .5H₂O in to its components. Since solubility is most important in this experiment, CUSO₄ is more soluble in the highly polar solvent H₂O than in a solvent of low polarity, such as ethanol.
Procedure- 1. Obtain …show more content…
Weigh the beaker containing the mixture and calculate the mass of the unknown 4. Add 50ML of water containing about 1ML OF 3M H₂SO₄ solution to the beaker 5. Heat the mixture on a hot plate, constantly stirring until all the solid material has dissolved 6. Avoid boiling the solution while heating it 7. Remove the beaker from the heat, cover it with a watch glass, and allow it to cool enough to be comfortable to the touch. 8. Place the beaker in an ice bath and after a little while you will see a large quantity of salicylic acid needles settled in the bottom of the beaker. 9. Keep the beaker in the ice bath until crystallization is complete. 10. set up a vacuum filtration apparatus and place a piece of filtration paper in the Buchner funnel 11. Swirl the beaker and pour its contents in to the Buchner funnel 12. Transfer the salicylic acid crystals as completely as possible to filter paper 13. Pour the blue solution collected in the filtration flask in to a second clean beaker and reserve it for the crystallization of …show more content…
Weigh the dry product and report the mass of CUSO₄.5H₂O recovered
Data
Unknown number | C | Mass of unknown +beaker | 50.4g | Mass of beaker | 47.9g | Mass of unknown mixture | 2.5g | Salicylic acid crystallization Mass of weighing paper + salicylic acid | 4.3g | Mass of weighing paper | 1.8g | Mass of salicylic acid | 2.5g | Calculation of percent salicylic acid in original mixture | 100% | CUSO₄.H₂O crystallization Mass of weighing paper + CUSO₄.5H₂O | 5.3g | Mass of weighing paper | 0.4g | Mass of CUSO₄.5H₂O | 4.9g | Calculation of percent CUSO₄.5H₂O in original mixture | 196% | Calculation %of S.A= M OF S.A/2.5G % of S.A= 2.5g/2.5g*100% =100% %CUSO₄.5H₂O= M OF CUSO₄/2.5g %CUSO₄.5H₂O=4.9g/2.5g*100 = 196%
Mrs. Amy Cook
February, 9 2011
Lab report on separation of mixtures
Purpose- The purpose of this lab is to separate or isolate the desired product from large amounts of solvent and by-products. It is also followed by a purification step that removes trace amounts of other substances from the final product. One of the experimental techniques that we used in the lab to separate or purify mixture is fractional crystallization. In the experiment we used fractional crystallization to resolve a mixture of salicylic acid and CUSO₄ .5H₂O in to its components. Since solubility is most important in this experiment, CUSO₄ is more soluble in the highly polar solvent H₂O than in a solvent of low polarity, such as ethanol.
Procedure- 1. Obtain …show more content…
Weigh the beaker containing the mixture and calculate the mass of the unknown 4. Add 50ML of water containing about 1ML OF 3M H₂SO₄ solution to the beaker 5. Heat the mixture on a hot plate, constantly stirring until all the solid material has dissolved 6. Avoid boiling the solution while heating it 7. Remove the beaker from the heat, cover it with a watch glass, and allow it to cool enough to be comfortable to the touch. 8. Place the beaker in an ice bath and after a little while you will see a large quantity of salicylic acid needles settled in the bottom of the beaker. 9. Keep the beaker in the ice bath until crystallization is complete. 10. set up a vacuum filtration apparatus and place a piece of filtration paper in the Buchner funnel 11. Swirl the beaker and pour its contents in to the Buchner funnel 12. Transfer the salicylic acid crystals as completely as possible to filter paper 13. Pour the blue solution collected in the filtration flask in to a second clean beaker and reserve it for the crystallization of …show more content…
Weigh the dry product and report the mass of CUSO₄.5H₂O recovered
Data
Unknown number | C | Mass of unknown +beaker | 50.4g | Mass of beaker | 47.9g | Mass of unknown mixture | 2.5g | Salicylic acid crystallization Mass of weighing paper + salicylic acid | 4.3g | Mass of weighing paper | 1.8g | Mass of salicylic acid | 2.5g | Calculation of percent salicylic acid in original mixture | 100% | CUSO₄.H₂O crystallization Mass of weighing paper + CUSO₄.5H₂O | 5.3g | Mass of weighing paper | 0.4g | Mass of CUSO₄.5H₂O | 4.9g | Calculation of percent CUSO₄.5H₂O in original mixture | 196% | Calculation %of S.A= M OF S.A/2.5G % of S.A= 2.5g/2.5g*100% =100% %CUSO₄.5H₂O= M OF CUSO₄/2.5g %CUSO₄.5H₂O=4.9g/2.5g*100 = 196%