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The Nernst Equation

Q. At 56.0 °C, what is the maximum value of the reaction quotient, Q, needed to produce a no-negative E value for the reaction SO4^2-(aq) + 4H^+(aq) + 2Br^-(aq) ⇌ Br2(aq) + SO2(g) + 2H2O(l) In other words, what is Q when E = 0 at this temperture? Express your answer numerically to two significant figures.

Solved • Mar 7, 2020

The Nernst Equation

Q. A voltaic cell is constructed with two silver-silver chloride electrodes, where the half-reaction is AgCl (s) + e^- → Ag (s) + Cl^- (aq) E° = +0.222 V. The concentrations of chloride ion in the two compartments are 0.0100 M and 1.55 M, respectively. The cell emf is _____ V. a) 0.228 b) 0.00143 c) 0.130 d) 0.130 e) 34.4

Solved • Mar 5, 2020

The Nernst Equation

Q. A voltaic cell is constructed with two Zn^2+ -Zn electrodes. The two cell compartments have [Zn^2+] = 1.7 M and [Zn^2+] = 1.70x10^-2M, respectively. What is the cell emf for the concentrations given? Express your answer using two significant figures.

Solved • Mar 5, 2020

The Nernst Equation

Q. A voltaic cell utilized utilizes the following reaction: 2Fe^3+(aq) + H2(g) → 2Fe^2+(aq) + 2H+(aq). What is the emf for this cell when [Fe^3+] = 3.70 M, PH2 = 0.93 atm, [Fe^2+] = 8.0x10^-4 M, and the pH i both compartments is 4.05? Express your answer using two significant figures.

Solved • Mar 5, 2020

The Nernst Equation

Q. For the reaction 2Co^3+(aq) + 2Cl^-(aq) → 2Co^2+(aq) + Cl2(g). E° = 0.483 V what is the cell potential at 25°C if the concentrations are [Co^3+] = 0.671 M , [Co^2+] = 5.80x10^-2 M, and [Cl^-] = 0.845 M, and the pressure of Cl2 is PCl2 = 7.00 atm? Express your answer with the appropriate units.

Solved • Mar 4, 2020

The Nernst Equation

Q. What is the pH of the solution in the cathode compartment of the following cell if the measured cell potential at 25 ∘C is 0.56 V ? Zn(s) ∣ Zn2+(1M)∣ ∣H+(?M)∣ ∣H2(1atm)| Pt(s)

Solved • Mar 16, 2020

The Nernst Equation

Q. An electrochemical cell is based on these two half-reactions: Oxidation: Ni(s) --> Ni2+(aq, 2.4M)+2e- Reduction:VO2+(aq, 0.093M)+2H+(aq, 1.0M)+e- --> VO2+(aq, 2.4M) +H2O(l) calculate the cell potential.

Solved • Mar 9, 2020