The dissolution reactions of gold (Au) in 1M HNO3 and 1M aqua regia (1M HNO3 + 1M HCI) are given below. Аu) + NOз (аq) + 4 H* » Au3+ + NO (g) (aq) + 2 H20(1) (1) (ад) Au(s) + NO3 + 4 H* (ag) + 4 Cl¯ (aq) (aq) → AuCl4¯ + NO(9) + 2 H20) (g) (2) (aq) Reduction Half – Reaction E° (V) Au3+ + 3 e- = Au 1.36 AuCl4 + 3 e¯ → Au + 4 Cl- 1.00 NO3- + 4 H* + 3 e¯ → NO + 2 H20 0.96 2 H30+ + 2 e 2 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)]. Au3+ (аq) + 4 Cl (aq) → AuCl4 (aq) Important Information Atomic Masses (g/mol): H = 1.01, C = 12.01, N = 14.01, O = 16.00, %D Ne = 20.18, CI = 35.45, K = 39.10, Ar = 39.95, Cu = 63.55, Ag = 107.87 %3D %3D wwm Constants: R = 8.314 J/mol·K = 0.08206 L·atm/mol·K %3D ww m www m F = 96,485 C/mol = 96,485 J/V•mol %3D

The dissolution reactions of gold (Au) in 1M HNO3 and 1M aqua regia (1M HNO3 + 1M HCI) are given below. Аu) + NOз (аq) + 4 H* » Au3+ + NO (g) (aq) + 2 H20(1) (1) (ад) Au(s) + NO3 + 4 H* (ag) + 4 Cl¯ (aq) (aq) → AuCl4¯ + NO(9) + 2 H20) (g) (2) (aq) Reduction Half – Reaction E° (V) Au3+ + 3 e- = Au 1.36 AuCl4 + 3 e¯ → Au + 4 Cl- 1.00 NO3- + 4 H* + 3 e¯ → NO + 2 H20 0.96 2 H30+ + 2 e 2 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)]. Au3+ (аq) + 4 Cl (aq) → AuCl4 (aq) Important Information Atomic Masses (g/mol): H = 1.01, C = 12.01, N = 14.01, O = 16.00, %D Ne = 20.18, CI = 35.45, K = 39.10, Ar = 39.95, Cu = 63.55, Ag = 107.87 %3D %3D wwm Constants: R = 8.314 J/mol·K = 0.08206 L·atm/mol·K %3D ww m www m F = 96,485 C/mol = 96,485 J/V•mol %3D

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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