The following is a portion of the Reduction Potential Table from your text (Tabl

Question

The following is a portion of the Reduction Potential Table from your text (Table 18.1, Zumdahl), with half-reactions ordered as described in the Introduction to this experiment. half-reaction +3eMnO2 + 2 H,0 02 + 2H2O + 4e-. Cr3+ 3eCr Li +e Li a. Which species is the reducing agent in the first half-reaction? b. Which species in the table is the strongest reducing agent? c. Which species in the table is the strongest oxidizing agent? d. Is the reaction of Cr with MnO, to produce Cr and MnO, spontaneous? e. Write the balanced chemical equation for the reaction of Cr" with Li. (Take into account the discussion on p. 123.)

Explanation / Answer

a)

reducing agent--> species which is oxidized, so choose the most negativ evalue

Li(s) is the best reducing agent

b)

strongest reducing agent, as stated above, is Li(s)

c)

storngest oxidizing agnet is the species which reduces areadily

thereofre, must be MnO4-

d)

Most likely since MnO4- is stronger oxidizingagnet, it will be oxidizing all species listed, including Cr

e)

balance:

Li(s) + Cr3+(aq) = Cr(s)+ Li+(aq)

balance

3Li(s) + Cr3+(aq) = Cr(s)+ 3Li+(aq)

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