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masc lab 7 write up

masc lab 7 write up - Geoff Martindale Tuesday 1:00 Lab...

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Geoff Martindale Tuesday 1:00 Lab MASC 110L Lab #7 Objective: The objective of this lab is to observe the aqueous corrosion of various metals and to then determine which metals are more corrosive than others. Theory: When a metallic object is submersed in water some of it will dissolve into ions and release the free electrons into the water. The surrounding area will then become saturated with the ions making it increasingly difficult for the metallic rod to release ions into the water. If a dissimilar metal is placed in the water and electrical contact is made between the two, then electrons will flow to the metal with the greater potential making it possible for the dissolution of ions to continue. The five metals used—zinc, aluminum, iron, brass, and copper—will have a greater or lesser tendency to dissolve compared to other metals. A metal that has a greater tendency to dissolve is called anodic because it will accumulate more electrons faster than a metal that is cathodic in comparison. A volt meter can be used to measure the electric potential without corrosion actually occurring because a voltmeter in theory has infinite resistance. When the multi-meter is then switched to the ammeter function, current is allowed to flow and corrosion takes place.
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