Manganese Lab Report
Tris(acetylacetonato)manganese
Dissolve 0.26 g manganese(II) chloride tetrahydrate and 0.68 g of sodium acetate in 10 mL of distilled water. Add 1 g acetylacetone and swirl the mixture. With magnetic stirring, add dropwise a solution of 0.052 g potassium permanganate in 2.5 mL of distilled water over a period of 10-15 minutes. Stir for 10 minutes, then add dropwise a solution of 0.63 g sodium acetate in 2.5 mL distilled water. Heat the resulting mixture on a hot plate to between 60 and 70oC for 15 minutes, with stirring, then cool to room temperature. Isolate the product by suction filtration and wash it with 6.0 mL of cold distilled water. Suction dry for 15 minutes, then dry in air. Determine % yield.
Recrystallize about 0.2 g of the crude …show more content…
Place a small glass funnel in the mouth of the flask to serve as a reflux condenser, and boil on a steam bath for 5 minutes. Carefully decant the solution into a 100 mL Erlenmeyer, leaving any solid residue behind, and add 5 mL of methanol. Reheat to dissolve, then cool to room temperature. Isolate the product by suction filtration. Wash with a little ice-cold methanol, and suction dry, then air dry.
Diaquobis(acetylacetonato)cobalt
To a solution of 80 mg NaOH in 1 mL H2O, slowly add 200 mg (2 mmole) acetylacetone, with swirling. Any white solid formed at this point must be dissolved before continuing. This yellow solution is added dropwise, with stirring, to a solution of 238 mg (1 mmole) CoCl2.6H2O in 1.5 mL of water. Isolate the product by suction filtration and wash with water until the washings are nearly colorless (2-5 mL). Suck dry for 10 minutes, then air dry for a further hour. Weigh the product and calculate %yield.
Dissolve the crude product in a hot mixture of 2 mL ethanol and 1.3 mL chloroform (do not boil the resulting solution). Gravity filter through a Kimwipe plug in a Pasteur pipet. Cool the filtrate slowly to room temperature, then cool further in an ice bath. Isolate the product by suction filtration, wash with cold ethanol/H2O (20/1 v/v), and suck …show more content…
It is necessary to recrystallize it in order to obtain pure Zn(C5H7O2)2.H2O. To do this, prepare a solution of acetone and distilled water that contains 35 mL of acetone plus 15 mL of water and add 1 mL of acetylacetone to it. The acetylacetone serves to prevent decomposition of the product. Finally, add the precipitate to the solution and stir thoroughly. What is the appearance of the solution? Fit a long- or short-stem funnel with a piece of fine filter paper for a gravity filtration and filter the mixture. The filtrate, which should be clear but not necessarily colorless, is collected in a beaker. Cover the beaker with a watch glass or a loosely fitting piece of aluminum foil and store it as directed by your instructor until the next period. It is desirable that partial evaporation of the solvent occur during the
Dissolve 0.26 g manganese(II) chloride tetrahydrate and 0.68 g of sodium acetate in 10 mL of distilled water. Add 1 g acetylacetone and swirl the mixture. With magnetic stirring, add dropwise a solution of 0.052 g potassium permanganate in 2.5 mL of distilled water over a period of 10-15 minutes. Stir for 10 minutes, then add dropwise a solution of 0.63 g sodium acetate in 2.5 mL distilled water. Heat the resulting mixture on a hot plate to between 60 and 70oC for 15 minutes, with stirring, then cool to room temperature. Isolate the product by suction filtration and wash it with 6.0 mL of cold distilled water. Suction dry for 15 minutes, then dry in air. Determine % yield.
Recrystallize about 0.2 g of the crude …show more content…
Place a small glass funnel in the mouth of the flask to serve as a reflux condenser, and boil on a steam bath for 5 minutes. Carefully decant the solution into a 100 mL Erlenmeyer, leaving any solid residue behind, and add 5 mL of methanol. Reheat to dissolve, then cool to room temperature. Isolate the product by suction filtration. Wash with a little ice-cold methanol, and suction dry, then air dry.
Diaquobis(acetylacetonato)cobalt
To a solution of 80 mg NaOH in 1 mL H2O, slowly add 200 mg (2 mmole) acetylacetone, with swirling. Any white solid formed at this point must be dissolved before continuing. This yellow solution is added dropwise, with stirring, to a solution of 238 mg (1 mmole) CoCl2.6H2O in 1.5 mL of water. Isolate the product by suction filtration and wash with water until the washings are nearly colorless (2-5 mL). Suck dry for 10 minutes, then air dry for a further hour. Weigh the product and calculate %yield.
Dissolve the crude product in a hot mixture of 2 mL ethanol and 1.3 mL chloroform (do not boil the resulting solution). Gravity filter through a Kimwipe plug in a Pasteur pipet. Cool the filtrate slowly to room temperature, then cool further in an ice bath. Isolate the product by suction filtration, wash with cold ethanol/H2O (20/1 v/v), and suck …show more content…
It is necessary to recrystallize it in order to obtain pure Zn(C5H7O2)2.H2O. To do this, prepare a solution of acetone and distilled water that contains 35 mL of acetone plus 15 mL of water and add 1 mL of acetylacetone to it. The acetylacetone serves to prevent decomposition of the product. Finally, add the precipitate to the solution and stir thoroughly. What is the appearance of the solution? Fit a long- or short-stem funnel with a piece of fine filter paper for a gravity filtration and filter the mixture. The filtrate, which should be clear but not necessarily colorless, is collected in a beaker. Cover the beaker with a watch glass or a loosely fitting piece of aluminum foil and store it as directed by your instructor until the next period. It is desirable that partial evaporation of the solvent occur during the