Explore BrainMass
Share

Balancing a Reaction

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

Balance the following reactions:

Pb(s) + PbO2(s) + H2SO4 --> PbSO4(s)
H3AsO4 + Zn(s) --> As + Zn^+2
O3 + NO --> O2 + NO2

© BrainMass Inc. brainmass.com October 24, 2018, 5:50 pm ad1c9bdddf
https://brainmass.com/chemistry/physical-chemistry/balancing-disproportionation-reaction-22400

Solution Preview

Please see the attached file for solutions.

Balance-ACID-Pb(s) + PbO2(s) + H2SO4 arrow PbSO4(s)

Must first divide into 2 half reactions.....
This one is hard, unless you are familiar with disproportionation reactions.....This above question is like a reverse disproportionation.

Pb  PbSO4 (1)
Lead metal (Pb0) going to Pb2+

PbO2  PbSO4 (2)
Pb4+ going to Pb2+

For a simplification, ignore the anion associated with the acid...

Pb0  Pb2+ (1)
Everything else other than O and H+ (bear with me) not needed
Balance O, then balance H+ (you will se in just a bit) not needed
Balance out charge by adding electrons to the side with the more positive charge...add 2 e-'s to right hand side (RHS)
Pb0  Pb2+ + 2 e- (1)
Done......

PbO2  Pb2+ (2)
Everything else other than O and H+ (bear with me) not needed
Balance O ...

Solution Summary

This question is like a reverse disproportionation reaction. You must first divide it into 2 half reactions. For a simplification, ignore the anion associated with the acid. The next thing to do is to add the two reactions together in such a way as to eliminate electrons. Now we can in the acid anions to both sides to balance out.

$2.19
See Also This Related BrainMass Solution

Balancing Chemical Reaction

Example: Balance the following equation:

___ Cu + ___ O? ----> ___ Cu?O

You should get the following:

4Cu + O? ----> 2Cu?O

You can report:

4,1,2

Balance these equations:

___ Na?PO? + ___ KOH --> ___ NaOH + ___ K?PO?

___ P? + ___ O? --> ___ P?O?

___ Pb(OH)? + ___ HCl --> ___ H?O + ___ PbCl?

___ AlBr? + ___ K?SO? --> ___ KBr + ___ Al?(SO?)?

___ CaCO? + ___ HCl --> ___ CaCl? + ___ H?O + ___ CO?

View Full Posting Details