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To determine to order of increasing reducing power, you can reference the standard reduction potential sheet that is given during the test (or in the textbook in appendix 2B). Standard reduction potential is an element's/compound's inclination to be reduced, and the more positive the potential, the more likely it will be reduced.
To rank elements by their reducing power, this means that the element itself is the one that's probably going to be oxidized in the reaction. You can think of it like the more reducing power an element has, the more likely it's going to be oxidized because it's giving up an electron to reduce another element. So, when looking at the standard reduction potential table, the more negative the reduction potential is, the stronger its reducing power.
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