A tarnished silver knife is placed in a beaker containing hot aqueous NaHCO3. A piece of Al foil is placed in the solution so that it touches the knife. The deposit of Ag2S disappears and the clean knife is recovered from the solution,
(a) Using Appendix and the data given below, write an equation for the electrochemical process that cleans the knife, and determine E°cell and ΔG°ccn (298 K).
(b) A12S3 is decomposed by water. Write an equation to show what happens,
(c) Write an equation for the equilibria set up when NaIICO3 is added to H2O. Suggest two reasons why aqueous NaFICO3 rather than distilled water is used in the cleaning process. Data: Ag2S + 2e– ⇌ 2Ag + S2- E° = -0.69 V
Ksp for Al(OFI)3 = 1.9 x I0-33
[Based on: M.M. Ivey et al. (2008) J. Chem. Educ., vol. 85, p. 68.]
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