151F09Lab09D2L

151F09Lab09D2L - GenChem 9 Class th Today's Agenda: Develop...

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GenChem 9 th Class Today’s Agenda: Develop the problem. Perform first challenge: preparing a known. Discuss results. Perform second challenge: reactions of anions and cations. Develop a consensus on the correct values. Perform third challenge: perform test reactions. Design an analysis scheme. Qualitativeis Week one of a two-week experiment
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GenChem Public hearings slated on Rosemont mine plan GARRY DUFFY Tucson Citizen Consider the metal-extraction industry:
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GenChem What will the Rosemont Mining Company need to know before investing their time, money and political capital in this project? What valuable metals can they mine How much?
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GenChem For this experiment we’ll ignore the “ how much ” question and focus on “ what’s there ”. The Problem put to your group is to develop an analysis scheme to determine the presence of selected metal cations in an ore sample.
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GenChem ROSEMONT MINERAL RESERVES Classification Sulfide >= 3.29 $/ton NSR Cutoff Oxides >= 1.77 $/ton NSR Ktons NSR $/t TCu% Mo% Ag oz/t Ktons NSR $/t TCu% Proven 126,120 12.25 0.5 0.015 0.14 9,938 3.22 0.19 Probable 366,607 11.29 0.46 0.015 0.12 39,507 2.96 0.17 Total 492,727 11.53 0.47 0.015 0.12 49,445 3.01 0.18 How do you propose to identify what metals are present? The identification needs to be based on a property or properties that differentiates one metal from another ( differentiating characteristic ) Let′s think!
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GenChem Most minerals do not contain metals in their native form, but combined as part of chemical compounds. Copper ( Cu ) Metals? Copper Carbonate ( CuCO 3 ) The copper in this compound exists as positive ions ( Cu 2+ ) combined with negative ions (carbonate- CO 3 2- ).
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Ionic Compounds Many minerals are a mixture of these types of ionic compounds ” composed of positive ions of a
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151F09Lab09D2L - GenChem 9 Class th Today's Agenda: Develop...

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