HomeworkLib
Question

When sodium and chromium are the two available cations, using the activity series for oxidation half-reactions,...

When sodium and chromium are the two available cations, using the activity series for oxidation half-reactions, determine and write the chemical equation.

Na(s)---->Na^+ (aq) + e^ -

Cr(s)----> Cr^3+ (aq) + 3 e^ -

science   chemistry   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

The standard reduction potential values for the reduction of Na+(aq) and Cr3+(aq) are

Na+(aq) + 1e-  ----------------> Na(s), E0  = - 2.71V

Cr3+(aq) + 3e- ---------------> Cr(s), E0  = - 0.74 V

Since the standard reduction potential value is more for Cr3+(aq) , Cr3+(aq) will be reduced to Cr(s) and acts as an oxidizing agent, whereas Na(s) will be oxidized to Na+(aq) and acts as reducing agent.

Hence the half-cell rectionsa are

Oxidation half-cell: 3Na(s) --------------> 3Na+(aq) + 3e- ,  E0(oxi) = -(- 2.71V) = +2.71V

Reduction half-cell: Cr3+(aq) + 3e- ---------------> Cr(s), E0(red) = - 0.74 V

Hence the complete cell reaction can be written as

3Na(s) + Cr3+(aq) + 3e- ------------->  3Na+(aq) + 3e- +Cr(s), E0 (cell) =  E0(oxi) + E0(red) = +2.71V+ ( - 0.74 V)

or

3Na(s) + Cr3+(aq)-------------> 3Na+(aq) +Cr(s), E0 (cell) = 1.97V (answer)

0 0
Add a comment
Know the answer?
Add Answer to:
When sodium and chromium are the two available cations, using the activity series for oxidation half-reactions,...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Balance the following oxidation-reduction reactions using the half-reaction method. 1. HCOOH (aq) + MnO.. (aq) → CO2 (g) + Mn2. Acidie solution Identify the reduction half Identify the oxidation...

    Balance the following oxidation-reduction reactions using the half-reaction method. 1. HCOOH (aq) + MnO.. (aq) → CO2 (g) + Mn2. Acidie solution Identify the reduction half Identify the oxidation half Basic solution Identify the reduction half Identify the oxidation half Write a balanced equation for the electrode and overall cell reactions in the following galvanic cell and determine E°. Sketch the cell, labeling the anode and cathode and showing the direction of electron and ion flow. 2. 3. Circle the...

  • Using the activity series, which one of the reactions will proceed spontaneously? Beside each, write "WILL...

    Using the activity series, which one of the reactions will proceed spontaneously? Beside each, write "WILL PROCEED" (if it will proceed spontaneously) or "WILL NOT PROCEED" (if it will not proceed spontaneously). A) Sn() + Mn2+ (aq) → Sn2+ (aq) + Mn() B) Mg+2 (aq) + Cu(9) Mg ) + Cut2 (aq) C.) 2Ag+ (aq) + Ni () + 2Ag (9) + Ni2+ (a (aq) Given the following balanced net ionic equation: Mn + Cr+2 (aq) + Mn+2 (aq) +...

  • Using the guideline for oxidation numbers, write the oxidation half-reactions for the following: ...

    Using the guideline for oxidation numbers, write the oxidation half-reactions for the following: Example: Na→ Na ^ +1 + 1 e- would be the input for Na → Na+1 + 1e-    QUESTION 2 Using the guideline for oxidation numbers, write the oxidation half-reactions for the following: Example: Na→ Na ^ +1 + 1e-would be the input for Na → Na+1 + 1 e. c. Be QUESTION 3 Transition metals have five d-orbitals, which contribute to a variety of different possibilities...

  • Question 7 (Mandatory) (5 points) Using the following portion of the activity series for oxidation half...

    Question 7 (Mandatory) (5 points) Using the following portion of the activity series for oxidation half reactions Ca(s) - Ca2+(aq) + 2e Mg(s) -- Mg2+(aq) + 2e Zn(s) - Zn2+(aq) + 2e Cu(s) -- Cu2+(aq) + 2e determine which reaction will not occur. Ca(s) with Zn2+(aq) Zn(s) with Cu2+(aq) Zn(s) with Mg2+(aq) O Ca(s) with Cu2+(aq)

  • (1) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction....

    (1) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. • •half-reaction •identification •Cr(s) = Cr3+(aq) + 3e- • oxidation/reduction •Co2+(aq) + 2e- = Co(s) • oxidation/reduction (2) Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients.

  • Separate the following redox reactions into half-reactions, and label each half-reaction as oxidation or reduction. Part...

    Separate the following redox reactions into half-reactions, and label each half-reaction as oxidation or reduction. Part A Oxidation half-reaction for 2Li(s)+2H+(aq)→2Li+(aq)+H2(g). Express your answer as a chemical equation. Identify all of the phases in your answer. Part B Oxidation half-reaction for 2Ag+(aq)+Be(s)→Be2+(aq)+2Ag(s). Express your answer as a chemical equation. Identify all of the phases in your answer.

  • Using the activity series, predict whether the following reactions would be expected to proceed spontaneously. Cu...

    Using the activity series, predict whether the following reactions would be expected to proceed spontaneously. Cu (*) + 2Ag (aq) → Cu²+ (aq) + 2Ag (6) a.) Will proceed spontaneously b.) will not proceed spontaneously Using the activity series, predict whether the following reactions would be expected to proceed spontaneously. Mg (6) + Fe2+ → Mg²+ (aq) + Fe (3) (aq) a.) Will proceed spontaneously b.) will not proceed spontaneously Using the activity series, predict whether the following reactions would...

  • Question 17 Write a balanced chemical equation for the oxidation of chromium metal with nitric acid....

    Question 17 Write a balanced chemical equation for the oxidation of chromium metal with nitric acid. Assume the reaction products are Cr" and NH 30H*(aq) + 3NO; - (aq) + 8Cr(s) - 3NH, (aq) + SCP-(aq) +9H 0(1) H+ (aq) + NO, (aq) + Cr(s) -- NH4+ (aq) + Cr(aq) 10H"(aq) + NO3(aq) + 3C+(3) -- NH4+(aq) + 3Cr"(aq) + 3H-01 4H" (aq) + NO; Taq) - Cr(s) - NH(aq) + Craq) 10H"(aq) + NO3- (aq) + Cr(s) - NH....

  • A voltaic cell contains two half-cells. One half-cell contains a chromium electrode immersed in a 1.00...

    A voltaic cell contains two half-cells. One half-cell contains a chromium electrode immersed in a 1.00 M Cr(NO_3)_3 solution. The second half-cell contains a nickel electrode immersed in a 1.00 M Ni(NO_3)_2 solution. Cr^3+(aq) + 3 e^- rightarrow Cr(s) E_red^degree = 0.744 V Ni^2+(aq) + 2e^- rightarrow Ni(s) E_red^degree = -0.257 V Using the standard reduction potentials given above, predict the standard cell potential of the voltaic cell. Write the overall balanced equation for the voltaic cell. (Include states-of-matter under...

  • (1) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction....

    (1) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. half-reaction identification Cd(s)Cd2+(aq) + 2e- Ag+(aq) + e-Ag(s) Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients. ? + ? ? + ? 2. Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. half-reaction identification Mn(s)Mn2+(aq) + 2e- Zn2+(aq) + 2e-Zn(s) (2) Write a balanced equation for the overall redox reaction. Use smallest...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT