11-12 - Step 1 Look up the reactions in Table 11.1 List...

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 Writing Redox Net Reactions Step 1:  Look up the reactions in Table 11.1.             List them with most negative on top, and most                  positive on bottom. Step 2:  Imagine the orbitals on the left on empty,             and the orbitals on the right are full. Step 3:  Circle the species actually present. Step 4:  Select the pair in which the electrons travel              from high energy orbitals to low energy vacant              orbitals.  If you can’t spot any such situation,              there is no spontaneous redox reaction. Step 5:  If there is a spontaneous redox reaction, the              top redox 1/2 reaction must be reversed,              because it is an oxidation. Step 6:  Add the reactions in such a way that the             electrons cancel.
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 Writing Redox Net Reactions Write the net equation for the reaction  (if there is one) when hydrogen gas is bubbled into a nickel(II) iodide solution. Solubility rule:  NiI 2  is soluble Find the reduction potentials associated with the reactants in Table 11.1. Section 11.5
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2H 1+ (aq)  + 2e 1- H 2 (g) 0.00 V I 2 (s)  + 2e 1- 2I 1- (aq) +0.54 V Ni 2+ (aq)  + 2e 1- Ni (s) -0.23 V ? Section 11.5 Step 1:  Look up the reactions in Table 11.1.             List them with most negative on top, and most                  positive on bottom. 2H 1+ (aq)  + 2e 1- H 2 (g)    0.00 V Ni 2+ (aq)  + 2e 1- Ni (s)    -0.23 V + - ε I 2 (s)  + 2e 1- 2I 1- (aq)      +0.54 V
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2H 1+ (aq)  + 2e 1- H 2 (g)    0.00 V Ni 2+ (aq)  + 2e 1- Ni (s)    -0.23 V H 2 (g)  +  Ni 2+ (aq)  +   2I 1- (aq) + -
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