Consider the half-reaction Cr³⁺(aq) $\rightarrow$ Cr₂O₇²^-(aq).When the equation is balanced in acid solution, the coefficient for water will be__________, and the number of electrons transferred will be __________.

Question

Quizplus · Accepted Answer

First, we need to balance the half-reaction in acidic solution. 
CrS1U1P13 + 7 H1U1B12O1U1P0S1U1B17S1U1B0S1U1P12 + 6 F1F1F1S1-  ->  Cr3+ + 3 S1U1B12O1U1P0S1U1B17S1U1B0S1U1P12 + 6 F1F1F10 + 5 H2O 
The coefficient for water is 5 and the number of electrons transferred is 6. Therefore, the answer is C.

Consider the Half-Reaction Cr3+(aq) →\rightarrow→ Cr2O72-(aq)

Consider the Half-Reaction Cr³⁺(aq) $\rightarrow$ Cr₂O₇²^-(aq)