exercise 6 - Chemistry 312 Names: Exercise 6: Nickel...

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Unformatted text preview: Chemistry 312 Names: Exercise 6: Nickel complexes and color The following procedure is similar to what you will see in class. Demonstration Procedure: Set the six beakers of nickel sulfate hydrate solution in a row. Set the white paper or cardboard behind the beakers. Put a stir rod in all the beakers except the first. Do not add anything to the first beaker (the color should be green). Add 40 mL of 5 M ammonia to the second beaker and stir (color should turn to a "deep" blue). Add 5 ml of 25% ethylenediamine to the third beaker and stir (color should turn light blue). Add 10 mL of 25% ethylenediamine to the fourth beaker and stir (color should turn blue). Add 15 mL of 25% ethylenediamine to the fifth beaker and stir (color should turn purple). Add 25 mL of 1% dimethylglyoxime to the sixth beaker and stir (color should turn red; a precipitate forms also). Note: ethylenediamine (en) = NH 3 CH 2 CH 2 NH 3 dimethylglyoxime (dmg) = (OH)N=C(CH 3 )C(CH 3 )=N(OH) Both ligands are bidentate and both bond to the metal through the lone pair on each...
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exercise 6 - Chemistry 312 Names: Exercise 6: Nickel...

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