A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 ∘C. The initial concentrations of Pb2+ and Cu2+ are 0.0520 M and 1.60 M , respectively. a) What is the initial cell potential? Express your answer using two significant figures.b) What is the cell potential when the concentration of Cu2+ has fallen to 0.230 M ? Express your answer using two significant figures.c) What is the concentration of Pb2+ when the cell potential falls to 0.370 V ? Express your answer using three significant figures.

Question
Asked Dec 3, 2019
49 views

A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 ∘C. The initial concentrations of Pb2+ and Cu2+ are 0.0520 M and 1.60 M , respectively. 

a) What is the initial cell potential? Express your answer using two significant figures.

b) What is the cell potential when the concentration of Cu2+ has fallen to 0.230 M ? Express your answer using two significant figures.

c) What is the concentration of Pb2+ when the cell potential falls to 0.370 V ? Express your answer using three significant figures.

 

check_circle

Expert Answer

Step 1

a)

Reaction at cathode:

Cu2+ + 2e- --> Cu(s)     Eocathode = 0.34 V

Reaction at anode:

Pb (s) --> Pb2+ + 2e-   Eoanode = -0.13 V

Number of moles of electrons involved, n = 2

Standard cell potential, Eo = Eocathode - Eoanode = 0.34 V- (-0.13 V) = 0.47 V.

 Initial cell potential can be calculated as follows,

help_outline

Image Transcriptionclose

Р- 0.0592 -log cell Го.052M) [1.60м] 0.0592 -log 2 Ecl0.47- cell =0.51V,initial cell potential

fullscreen
Step 2

b)

The cell reaction is given below.

Cu2+ + Pb (s)  --> Cu(s) + Pb2+

The new concentration of Cu2 = 0.23 M

Change in concentration of Cu2 = 1.6 M – 0.23 M = 1.37 M

Theref...

help_outline

Image Transcriptionclose

Pb2 Flog Cu2 0.0592 cell n 1422M -log [0.23M 0.0592 Ecl0.47- cell 2 0.45 V, cell potential

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

Electrochemistry

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: A sodium hydroxide (NaOH) solution is standardized using 1.008 grams of potassium hydrogen phthalate...

A: The given mass of potassium hydrogen phthalate is 1.008 g.The given molar mass of KHP is 204.23 g/mo...

question_answer

Q: How many covalent bonds are there in ClO2? Assume Cl will expand its octet to minimize formal charge...

A: Formal charge on an atom can be calculated as:

question_answer

Q: At −11.5 ∘C, a common temperature for household freezers, what is the maximum mass of sucralose (C12...

A: The depression in freezing point is given by

question_answer

Q: Consider thecombustion reaction. C3H8 + 5O2--------3CO2 + 4H2O Ifyou react 15.0 mol of O2  how many ...

A: The balanced combustion reaction is given by

question_answer

Q: Consider the following reaction: PCl5(g) ←→ PCl3(g) +Cl2(g) a. Write the equilibrium expression for ...

A: Given reaction:

question_answer

Q: For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-Lcontainer.A(...

A: Initial concentration of A and B can be determined using the formula for molarity.

question_answer

Q: » Postlab Questions Bonding and Moleculary Geometry V2 » 10-064: Mo Course Contents » 10-064: Molecu...

A: Molecular shape of BrF3 is T-shape. It has non-zero dipole moment (1.19 D); hence it is a polar mole...

question_answer

Q: Which of the following statements best explains why nitrogen gas at STP is less dense than Xe gas at...

A: Density of the gas is related to molar mass, pressure and the temperature by the equation below:

question_answer

Q: What is the change in enthalpy when 9.00 mol of sulfur trioxide decomposes to sulfur dioxide and oxy...

A: Reversing the given reaction: