The dissolution reactions of gold (Au) in 1M HNO3 and 1M aqua regia (1M HNO3 + 1M HCI) are given below. Aus) + NO3 (aq) + 4 H* (aq) → Au³* (aq) + NO(9) + 2 H20) (1) Aus + NO3¯ (aq) +4 H* (aq) + 4 Cl¯ (aq) AuCl," (ag) + NO9) + 2 H20(1) (2) Reduction Half – Reaction E° (V) - Au3+ + 3 e¯ Au 1.36 AuCl, +3 e- Au + 4 Cl- 1.00 NO3 +4 H* + 3 e¯ → NO +2 H20 0.96 2 H30* + 2 e¯ = H2 +2 H20 Calculate E°cel and Keg for the dissolution of gold in 1M HNO3 under standard conditions. Calculate E°cell and Keg for the dissolution of gold in aqua regia under standard conditions. Using the values calculated in a) and b), determine the formation constant (K+) of AuCl4“. The formation reaction is given below. [Hint, express K as a function of the Keq values from a) and b)]. Au** (aq) ,3+ (aq) + 4 Cl¯ (aq) → AuCl4 (aq)

The dissolution reactions of gold (Au) in 1M HNO3 and 1M aqua regia (1M HNO3 + 1M HCI) are given below. Aus) + NO3 (aq) + 4 H* (aq) → Au³* (aq) + NO(9) + 2 H20) (1) Aus + NO3¯ (aq) +4 H* (aq) + 4 Cl¯ (aq) AuCl," (ag) + NO9) + 2 H20(1) (2) Reduction Half – Reaction E° (V) - Au3+ + 3 e¯ Au 1.36 AuCl, +3 e- Au + 4 Cl- 1.00 NO3 +4 H* + 3 e¯ → NO +2 H20 0.96 2 H30* + 2 e¯ = H2 +2 H20 Calculate E°cel and Keg for the dissolution of gold in 1M HNO3 under standard conditions. Calculate E°cell and Keg for the dissolution of gold in aqua regia under standard conditions. Using the values calculated in a) and b), determine the formation constant (K+) of AuCl4“. The formation reaction is given below. [Hint, express K as a function of the Keq values from a) and b)]. Au** (aq) ,3+ (aq) + 4 Cl¯ (aq) → AuCl4 (aq)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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