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Copyright (c) 2006-2014 MindTouch Inc.
This file and accompanying files are licensed under the MindTouch Master Subscription Agreement (MSA).
At any time, you shall not, directly or indirectly: (i) sublicense, resell, rent, lease, distribute, market, commercialize or otherwise transfer rights or usage to: (a) the Software, (b) any modified version or derivative work of the Software created by you or for you, or (c) MindTouch Open Source (which includes all non-supported versions of MindTouch-developed software), for any purpose including timesharing or service bureau purposes; (ii) remove or alter any copyright, trademark or proprietary notice in the Software; (iii) transfer, use or export the Software in violation of any applicable laws or regulations of any government or governmental agency; (iv) use or run on any of your hardware, or have deployed for use, any production version of MindTouch Open Source; (v) use any of the Support Services, Error corrections, Updates or Upgrades, for the MindTouch Open Source software or for any Server for which Support Services are not then purchased as provided hereunder; or (vi) reverse engineer, decompile or modify any encrypted or encoded portion of the Software.
A complete copy of the MSA is available at http://www.mindtouch.com/msa
|Both dishes contain a solution of HCl, 3% H2O2, and KSCN. |
The solution in the dish containing the lone nail turns a pink color, and the intensity of the color increases over time. In the dish containing the nail/zinc metal connection, a gas is produced on the surface of the metal, but the pink color does not appear. When the connection between the nail and the zinc metal is severed, the solution begins to turn pink.
The pink coloration is due to the formation of Fe(SCN)2+/Fe(SCN)2+ complexes. This indicates that the iron metal is being oxidized to the Fe3+ ion. This won't occur in the second dish as long as the nail is connected to the zinc metal strip. When the two metals are connected, the zinc undergoes oxidation to Zn 2+ at the same time that H + ions are reduced to H2on the surface of the iron nail.
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