wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

For the equation in acidic medium: S2O23(aq)+Cr2O27(aq)S4O26(aq)+Cr3+(aq)
The coefficient of H+ in the balanced reaction by oxidation number method will be

Open in App
Solution

+2S2O23(aq)++6Cr2O27(aq)+2.5S4O26(aq)++3Cr3+(aq)
Cr2O27 is oxidising agent.
S2O23 is reducing agent.


+2S2O23(s)+2.5S4O26(aq) oxidation
nf=(|+2.52|×2=1
+6Cr2O27(aq)+3Cr3+(aq) reduction
nf=(|36|×2=6

Cross multiplying:
6 S2O23(aq)+1 Cr2O27(aq)S4O26(aq)+Cr3+(aq)

Balancing elements except O and H
6 S2O23(aq)+Cr2O27(aq)3 S4O26(aq)+2 Cr3+(aq)


Balancing oxygen atoms by adding H2O
6 S2O23(aq)+Cr2O27(aq)3 S4O26(aq)+2 Cr3+(aq)+7 H2O

Balancing hydrogen by adding H+
6 S2O23(aq)+Cr2O27(aq)+14H+3 S4O26(aq)+2 Cr3+(aq)+7H2O

Balancing charge:
charge in reactant side = -12-2+14=0
charge in product side = -6+6=0
so the balanced equation is 6 S2O23(aq)+Cr2O27(aq)+14H+3 S4O26(aq)+2 Cr3+(aq)+7H2O

The coefficient of H+ in balanced equation is is 14

flag
Suggest Corrections
thumbs-up
2
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Redox Reactions
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon