Answer to Question #260777 in Chemistry for Harpreet

Question

Balance the following half-reaction in an acidic solution: (4 marks) Cr2 O7 2- → Cr3

Answer 1

Solution:

Balanced half-reaction:

Cr₂O₇^2- + 14H⁺ + 6е- → 2Cr³⁺ + 7H₂O

or

Cr₂O₇^2-(aq) + 14H⁺(aq) + 6е- → 2Cr³⁺(aq) + 7H₂O(l)