Write a balanced redox equation for the reaction that occurs cr dissolves in 1 m h2cr2o7.

When Cr dissolves in 1 M H₂Cr₂O₇

Cr (s) ⇄ Cr³⁺ + 3 e⁻

Cr₂O₇²⁻ + 14 H⁺ + 6 e⁻ ⇄ 2 Cr³⁺ + 7 H₂O

by multiplying the first equation by 2 and add the 2 equations;

The balanced redox reaction will be:

2 Cr (s) + Cr₂O₇²⁻ (aq) + 14 H⁺ (aq) → 4 Cr³⁺ (aq) + 7 H₂O (l)