CH 101 notes 11-12

# CH 101 notes 11-12 - Step 1 Look up the reactions in Table...

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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. 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. H 2 (g) + NiI 2 (aq) Solubility rule: NiI 2 is soluble H 2 (g) + Ni 2+ (aq) + 2I 1- (aq) Find the reduction potentials associated with the reactants in Table 11.1. Section 11.5 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 H 2 (g) + Ni 2+ (aq) + 2I 1- (aq) ? 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 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) + - ε Empty acceptor orbitals I 2 (s) + 2e 1- 2I 1- (aq) +0.54 V Filled donor orbitals

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CH 101 notes 11-12 - Step 1 Look up the reactions in Table...

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