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Ch.19 - Electrochemistry
All textbooksMcMurry 8th EditionCh.19 - ElectrochemistryProblem 105
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Chapter 19, Problem 105

Copper reduces dilute nitric acid to nitric oxide (NO) but reduces concentrated nitric acid to nitrogen dioxide (NO2): Assuming that [Cu2+] = 0.10 M and that the partial pressures of NO and NO2 are 1.0 * 10-3 atm, calculate the potential (E) for reactions (1) and (2) at 25 °C and show which reaction has the greater thermodynamic tendency to occur when the concentration of HNO3 is (a) 1.0 M

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Welcome back everyone. We're told that iron can reduce sulfuric acid to produce solid sulfur. It can also reduce sulfuric acid to produce sulfur dioxide. What is the potential for reaction one? If there are 10.15 moller iron two plus catalon and 20.2 molar sulfuric acid, what is the potential for reaction to if there are 0.15 moller Iron County on 0.20 molar sulfuric acid and 1 80 M of sulfur dioxide gas, which of the two reactions has a greater thermodynamic tendency. If the concentration of sulfuric acid is 20.15 moller, we need to assume that sulfuric acid fully dissociates.
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Textbook Question

When suspected drunk drivers are tested with a Breathalyzer, the alcohol (ethanol) in the exhaled breath is oxidized to acetic acid with an acidic solution of potassium dichromate: The color of the solution changes because some of the orange Cr2O72- is converted to the green Cr3+ The Breathalyzer measures the color change and produces a meter reading calibrated in blood alcohol content. (a) What is E° for the reaction if the standard half-cell potential for the reduction of acetic acid to ethanol is 0.058 V?

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Textbook Question

When suspected drunk drivers are tested with a Breathalyzer, the alcohol (ethanol) in the exhaled breath is oxidized to acetic acid with an acidic solution of potassium dichromate: The color of the solution changes because some of the orange Cr2O72- is converted to the green Cr3+ The Breathalyzer measures the color change and produces a meter reading calibrated in blood alcohol content. (b) What is the value of E for the reaction when the concentrations of ethanol, acetic acid, Cr2O7 are 1.0 M and the pH is 4.00?

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Textbook Question
At one time on Earth, iron was present mostly as iron(II). Later, once plants had produced a significant quantity of oxygen in the atmosphere, the iron became oxidized to iron(III). Show that Fe2+(aq) can be spontaneously oxidized to Fe3+(aq) by O2(g) at 25°C assuming the following reasonable environmental conditions:
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Textbook Question
What is the pH of the solution in the cathode compartment of the following cell if the measured cell potential at 25 °C is 0.17 V?
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Textbook Question
Beginning with the equations that relate E°, ∆G°, and K, show that ∆G° is negative and K 7 1 for a reaction that has a positive value of E°
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Textbook Question
If a reaction has an equilibrium constant K 6 1, is E° posi-tive or negative? What is the value of K when E° = 0 V?
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