Experiment 10 & 11
Experiment #10 & #11
The Synthesis of Cobalt Oxalate Hydrate
The Synthesis of a Nitrite Complex February 5, 2012 Chemistry 1211L - 146 - Spring 2012
Procedure
The Synthesis of Cobalt Oxalate Hydrate
Place 100 ml of distilled water in a 250-ml (or 400-ml) beaker. Add 1.26g of oxalic acid dihydrate (H2C2O4.2H2O) and 1 ml of concentrated ammonia. Stir the mixture until the solid has dissolved completely.
Dissolve 2.34 g of cobalt chloride hexahydrate (CoCl2.6H2O) in 100 ml of water in an Erlenmeyer flask. While stirring the oxalic acid solution constantly, add the cobalt chloride solution drop by drop. Let the mixture cool in an ice bath. A precipitate will form slowly.
After the precipitate has had a chance to settle, collect it by gravity filtration. Wash the collected solid sparingly with cold water. Allow the water to drain from the collected solid. Then transfer the filter paper and precipitate to a paper towel so that excess moisture can be absorbed. Before you leave the lab, place your precipitate (still in its filter paper cone) in a beaker and leave it in your desk to air dry for at least three days. After your precipitate has dried thoroughly, weigh it on the analytical balance.
The Synthesis of a Nitrite Complex
Obtain an assignment of transition metal and non-transition metal from your instructor.
Weigh out 0.005 mole of the designated non-transition metal chloride and 0.005 mole of the designated transition metal chloride. (Remember to consider the numbers of waters of hydration in calculating the desired masses of the assigned salts.) Dissolve the two in a minimum volume (about 5 ml total) of distilled water, with low heat only if needed to dissolve the salts.
Weigh out 0.05 mole of KNO2, dissolve it in 5 ml of water, and then slowly add this solution, while stirring, to the solution of metal chlorides. Cool the mixture in an ice bath. Allow the solid to settle, then decant the supernatant liquid into a filter
The Synthesis of Cobalt Oxalate Hydrate
The Synthesis of a Nitrite Complex February 5, 2012 Chemistry 1211L - 146 - Spring 2012
Procedure
The Synthesis of Cobalt Oxalate Hydrate
Place 100 ml of distilled water in a 250-ml (or 400-ml) beaker. Add 1.26g of oxalic acid dihydrate (H2C2O4.2H2O) and 1 ml of concentrated ammonia. Stir the mixture until the solid has dissolved completely.
Dissolve 2.34 g of cobalt chloride hexahydrate (CoCl2.6H2O) in 100 ml of water in an Erlenmeyer flask. While stirring the oxalic acid solution constantly, add the cobalt chloride solution drop by drop. Let the mixture cool in an ice bath. A precipitate will form slowly.
After the precipitate has had a chance to settle, collect it by gravity filtration. Wash the collected solid sparingly with cold water. Allow the water to drain from the collected solid. Then transfer the filter paper and precipitate to a paper towel so that excess moisture can be absorbed. Before you leave the lab, place your precipitate (still in its filter paper cone) in a beaker and leave it in your desk to air dry for at least three days. After your precipitate has dried thoroughly, weigh it on the analytical balance.
The Synthesis of a Nitrite Complex
Obtain an assignment of transition metal and non-transition metal from your instructor.
Weigh out 0.005 mole of the designated non-transition metal chloride and 0.005 mole of the designated transition metal chloride. (Remember to consider the numbers of waters of hydration in calculating the desired masses of the assigned salts.) Dissolve the two in a minimum volume (about 5 ml total) of distilled water, with low heat only if needed to dissolve the salts.
Weigh out 0.05 mole of KNO2, dissolve it in 5 ml of water, and then slowly add this solution, while stirring, to the solution of metal chlorides. Cool the mixture in an ice bath. Allow the solid to settle, then decant the supernatant liquid into a filter