Question

Calculate the cell potential for the reaction as written at 25°C, given that [Cr^2+] = 0.822:

a) Insufficient information
b) 0.822 V
c) Positive cell potential
d) Negative cell potential

Answer 1

Insufficient information is provided to calculate the exact cell potential for the given reaction at 25°C. A complete calculation would require the standard cell potential and other relevant data, which are not supplied in the question.

Step-by-step explanation:

To calculate the cell potential for the given reaction at 25°C with [Cr2+] = 0.822, we need to apply the Nernst equation. However, the question provides insufficient data for a definitive calculation because it lacks the standard cell potential (E°cell), other ion concentrations, and any partial pressures of gases that may be involved in the cell's reaction. Without this information, we cannot determine whether the cell potential is positive or negative, nor calculate its exact value.

The general approach to solve this would be to use the standard reduction potential values from a reference source such as a standard electrochemical series table, and combine them according to the reaction to find E°cell. Then the Nernst equation would be used to adjust for non-standard conditions, such as the given concentration of Cr2+ ions.