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Final Review

# Final Review - Review Areas for Exam 39 Questions Resolve...

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Review Areas for Exam 39 Questions Resolve any homework grade issues with your TA before Friday No changes after that date.

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Chapter 12 Redox titrations and redox reactions e.g., if 1 g of K 2 CrO 4 solution is required to oxidize 100 ml of an aqueous solution of I - , then what is the concentration of I - in the original solution? CrO 4 2- + I - Cr 3+ + I 2 (balance by ox state) +6 -1 +3 0 CrO 4 2- + 3 I - Cr 3+ + 1.5 I 2 1 g CrO 4 2- = 1g/194.19 g/mol = 0.00515 mol So I - = 3x or 0.01544mol/.1 liter = 0.1544 M
cell PROBLEM: Zn (s) |Zn 2+ (aq) (0.010M ) || H + (aq) (2.5M )|H 2(g) (0.30atm) |Pt (s) PLAN: SOLUTION: [Zn 2+ ] = 0.010M [H + ] = 2.5M P = 0.30atm H 2 Calculate E cell at 25 0 C. Find E 0 cell and Q in order to use the Nernst equation. Determining E 0 cell : E 0 = 0.00V 2H + ( aq ) + 2e - H 2 ( g ) E 0 = -0.76V Zn 2+ ( aq ) + 2e - Zn( s ) E 0 = +0.76V Q = P x [Zn 2+ ] H 2 [H + ] 2 Q = 4.8x10 -4 Q = (0.30)(0.010) (2.5) 2 E cell = E 0 cell - 0.0592V n log Q

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Final Review - Review Areas for Exam 39 Questions Resolve...

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