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<p>[QUOTE=&quot;bruthajoe, post: 4284148, member: 108656&quot;]Removing copper over zinc seems difficult. </p><p>To do this experiment follow the modified protocol shown below:</p><p><br /></p><p>1. Cu (s) + 4 HNO3 (aq) → Cu(NO3)2 (aq) + 2 NO2 (g) + 2 H2O (l)</p><p><br /></p><ul> <li>Place a single penny (you should have determined its mass) into a 250-mL Erlenmeyer flask.</li> <li>Add 20 mL concentrated nitric (HNO3) acid.</li> <li>Let the penney completely dissolve, or if you believe all the copper has dissolved, you can remove the zinc core using a pair of forceps.</li> <li>Add about 20 mL of DI water....</li> </ul><p>[/QUOTE]</p><p><br /></p>

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