Experiment 6 - Experiment 6 Solution Tested Zn 2+ - no...

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Experiment 6 Solution Tested Zn 2+ - no color – 5 sec Cu 2+ - bright green – 2 sec Ag+ - no color – 5 sec 6.1 Only Cu 2+ appears to be detectable because it was a distinct color to begin with (blue) Solution Tested Zn(OH2)6 2+ - Zn 2+ - HBtB OY pH = 6 Cu(OH2)6 2+ - Cu 2+ - Bright Orange pH=4.5 Ag(OH2)2 + - Ag+ - Light Orange/More Yellow pH=7 6.2 1) Zn(OH2)6 2+ + 2H2O - Zn(OH2)5(OH)+ + 2H3O 2) Cu(OH2)6 2+ + 2H2O Cu(OH2)5OH+ + 2H3O 3) Ag(OH2)2 + H2O Ag(OH2)+OH + H3O 6.3 Since Mg 2+ didn’t react with a base, zinc shouldn’t either. 6.4 Mix 1 mL of ZnNO3 with 1M NaOH to produce the solid Zn(OH2)4(OH2). The minimum amount of [OH-] needed to be added is 2 drops of 1M NaOH. 6.5 Zn(OH2)6 2+ + 2OH- Zn(OH2)4(OH)2 (s) + 2H2O 6.6 Zn(OH2)4 (OH)2 (s) + 2OH- Zn(OH2)6 2+ + 4H2O 6.7 Cu(OH2)4(OH)2 will be more amphoteric than Zn(OH2)4(OH)2 because it is a stronger acid, able to be dissolved in OH- more easily. 6.8 After adding 5 mL of 6M NaOH to 5mL of 0.50M Cu(NO3)2, bright blue precipitate forms.
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This note was uploaded on 02/08/2012 for the course CHM 2046L taught by Professor Horvath during the Spring '08 term at University of Florida.

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Experiment 6 - Experiment 6 Solution Tested Zn 2+ - no...

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