Question

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in...


Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Pb and H+ in the balanced reaction?
Pb2+(aq) + NH+4(aq) → Pb(s) + NO−3(aq)
Pb = 1, H+ = 8
Pb = 3, H+ = 5
Pb = 4, H+ = 10
Pb = 2, H+ = 3
Pb = 1, H+ = 2
Please explain how to get answer.

Homework Answers

Answer #1

Pb+2 --> Pb

Pb atoms are balanced , so balance the charge

Pb+2 + 2e- ---> Pb

now

consider the other half reaction

NH4+ --> NO3-

balance the O atoms using H20

NH4+ + 3 H20 --> NO3-

balance the H atoms using H+

NH4+ + 3 H20 --> N03- + 10 H+

now balance the charge using electrons

NH4+ + 3 H20 --> N03- + 10 H+ + 8e-

now using common multiples , equate the electrons in both

NH4+ + 3 H20 --> NO3- + 10 H+ + 8e-

4 Pb+2 + 8e- --> 4 Pb

so the balanced reaction is

4 Pb+2 + NH4+ + 3 H20 --> 4 Pb + N03- + 10H+

so

the answer is

Pb = 4 , H+ = 10

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