Balance the Chemical Equation : Cr2O7 + NH3 gives Cr++ + NO3- - Chemistry - Redox reactions

Question

Balance the Chemical Equation :
Cr2O7 + NH3 gives
Cr++​ + NO3 -

Vartika Jain · Accepted Answer

Dear Student,

Cr2O72- + NH3 → Cr2+ + NO3-First half = Cr2O72- →Cr2+Balancing Cr by multiplying RHS by 2Cr2O72- → 2Cr2+Balancing O by adding 7H2O on RHS Cr2O72- → 2Cr2++7H2OBalancing H by adding 14H+ on LHS14H+ +Cr2O72-→ 2Cr2+ + 7H2OBalancing charge by adding electrons to the side having greater positive charge i
e
 LHS8e- +14H+ +Cr2O72-→ 2Cr2+ + 7H2O   
(i)Second half = NH3 → NO3-Balancing O by adding 3H2O on the LHSNH3 + 3H2O → NO3-Balancing H by adding  9H+ on RHSNH3 + 3H2O → NO3-+ 9H+Balancing charge by adding electrons to the side having greater positive charge i
e
 RHSNH3 + 3H2O → NO3- + 9H+ + 8e-  
(ii)Adding eq (i) and (ii) we get8e- +14H+ +Cr2O72-+NH3 + 3H2O →2Cr2+ + 7H2O+NO3- + 9H+ + 8e-or, Cr2O72-+NH3 + 5H+  →2Cr2++NO3-+ 4H2O

Balance the Chemical Equation : Cr2O7 + NH3 gives Cr++​ + NO3 -

Balance the Chemical Equation :
Cr₂O₇ + NH₃ gives Cr⁺⁺ + NO₃ ^-