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At the end of this lab, students should know...
A Reduction-Oxidation reaction, or redox reaction, results in a change of the oxidation state of the atoms in the reactants.
The oxidation state, or oxidation number, is the charge that an atom would have if each of its bonds to other elements were purely ionic.
Redox reactions are identified by tracking the oxidation number of each element in the reactants throughout the reaction. If there is no change in oxidation number of the same element in the products, the reaction is not a redox reaction.
The four mechanisms for redox reactions discussed here are the single-displacement reaction, the combustion reaction, the synthesis reaction, and the decomposition reaction.
The oxidation states of the atoms in a molecule must add up to the total charge of the molecule. For example, the oxidation numbers of the atoms in a neutral molecule must add up to zero.
Source: Smaa Koraym at Johns Hopkins University, MD, USA
Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed.
|1 Disposable 1-mL pipette|
|1 500-mL filter flask|
|1 83-mm Büchner funnel and adapter|
|1 Silicone vacuum tubing|
|1 Rubber stopper (size 15)|
|1 Glass thermometer|
|1 Filter paper|
|1 pH paper|
|1 Glass stirring rod|
|1 10-mL graduated cylinder|
|1 50-mL graduated cylinder|
|1 50-mL beaker|
|1 400-mL beaker|