Answer the following questions that refer to the unbalanced reaction shown below as it occurs in acidic solution:
_______ Cr₂O₇²^- (aq) + _______ I^-(aq) $\rightarrow$ _______ Cr³⁺(aq) + _______ I₂(s)
-Determine the coefficient for the Cr³⁺ ions.

Question

Answer the following questions that refer to the unbalanced reaction shown below as it occurs in acidic solution:
_______ Cr₂O₇²^- (aq) + _______ I^-(aq)

\rightarrow

_______ Cr³⁺(aq) + _______ I₂(s)
-Determine the coefficient for the Cr³⁺ ions.

Quizplus · Accepted Answer

The Cr and I ions have different coefficients in the reactants and products, so we need to balance their charges first by adding H+ ions. This gives:
Cr2S2O7-2(aq) + 14H+ (aq) + 6I- (aq) → 2Cr3+ (aq) + 3P4O10-4(aq) + 8H2O (l) + 3I2 (s)
Now we can balance the sulfur and phosphate ions, which gives:
Cr2S2O7-2(aq) + 14H+ (aq) + 6I- (aq) → 2Cr3+ (aq) + 3H2PO4- (aq) + 8H2O (l) + 3I2 (s)
The coefficient for the CrS13+ and P0 ions is therefore 2.

Answer the Following Questions That Refer to the Unbalanced Reaction →\rightarrow→

Answer the Following Questions That Refer to the Unbalanced Reaction $\rightarrow$