Lab Proposal

Lab Proposal - Experiment 29 Hydrometallurgy to Analyze a...

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Experiment 29 - Hydrometallurgy to Analyze a Chromite Sample Alex Elgin, Austin Garner, Alex Hill, McGee Hopper October 21, 2010 OBJECTIVES : To test for the presence of the components of Chromite Iron, Magnesium, and Chromium in an aqueous solution in order to determine whether or not an unknown sample is actually chromite ore. INTRODUCTION : In this experiment the chemical content of a metal ore will be determined. This metal ore is thought to be the mineral Chromite, the only metal ore of Chromium. Chromite contains magnesium, iron, and, of course, chromium. It is used in the production of stainless steal for the purpose of enhancing its hardenability and making this alloy more resistant to corrosion (Experiment 29, 379) Hydrometallurgy is this method that will be used to perform this experiment. In this experiment, the method of hydrometallurgy will utilize aqueous solution chemistry to recover the metals of the metal ore being used. In this process, the metal will be extracted after it is dissolved in a solvent and then removed from the solution. This process also usually involves leaching, which is simply dissolving the metal in water or an acid. (Experiment 29, 379) In this experiment, students are to determine if the ore contains magnesium, iron, and/or chromium. Emission spectra radiation can be used to identify some of the components of chromite. Magnesium, however, neither absorbs nor emits in the 200-900nm region of the spectrum. Students will therefore have to use the extraction process to isolate and precipitate magnesium. (Experiment 29, 380)
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For the experiment it is important to know that both Iron and Magnesium form insoluble precipitates in basic solutions, while zinc and chromium are amphoteric and form complex ions when reacted with excess base. Amphoterism is the ability of a substance to react with either an acid or a base. (Experiment 29, 381) Table 1 Chemical Activity of Some Elements Most Active K Ca Na Mg Al Zn Fe Co Pb H Cu Ag Least Active Beryllium Hydroxide Formation : 2OH - (aq) +Be 2+ (aq) + Be(OH) 2(s) Table 2 Solubilities of Some Ionic Compounds Table 3 Some Amphoteric Metal Hydroxides Metal Ion Insoluble in Limited OH - Soluble Complex Ion in Excess OH - Be 2+ Be(OH) 2 [Be(OH) 4 ] 2- Al 3+ Al(OH) 3 [Al(OH) 4 ] - Cr 3+ Cr(OH) 3 [Cr(OH) 4 ] - Zn 2+ Zn(OH) 2 [Zn(OH) 4 ] 2- Pb 2+ Pb(OH) 2 [Pb(OH) 4 ] 2- Co 2+ Co(OH) 2 [Co(OH) 4 ] 2- Cu 2+ Cu(OH) 2 [Cu(OH) 4 ] 2- Sn 2+ Sn(OH) 2 [Sn(OH) 4 ] 2- Table 4 Some Metal Hydroxides that Form Ammine Complexes Metal Ion Insoluble in Limited NH 3 Soluble Complex in Excess NH 3
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Ni 2+ Ni(OH) 2 [Ni(NH 3 ) 6 ] 2+ Ag + AgOH [Ag(NH 3 ) 2 ] + Zn 2+ Zn(OH) 2 [Zn(NH 3 ) 4 ] 2+ Cd 2+ Cd(OH) 2 [Cd(NH 3 ) 4 ] 2+ Co 2+ Co(OH) 2 [Co(NH 3 ) 6 ] 2+ Cu 2+ Cu(OH) 2 [Cu(NH 3 ) 4 ] 2+ Hg 2+ Hg(OH) 2 [Hg(NH 3 ) 4 ] 2+ PROCEDURE : Caution : When performing this experiment all lab members must wear eye protection that has been approved by the chemistry department. Ensure to wash your hands prior to touching your eyes and
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Lab Proposal - Experiment 29 Hydrometallurgy to Analyze a...

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