Question

A student studies the Fe³⁺/Fe²⁺ redox pair by using an electrochemical electrode and plotting the electrode potential vs. log₁₀ [Fe³⁺]/[Fe²⁺]. Which of the following is correct? A greater ratio of [Fe³⁺]/[Fe²⁺] in solution results in

Select one:

a. a negative gradient

b. a lower value of log([Fe³⁺]/[Fe²⁺])

c. a higher observed potential

A student noticed no change in the potential of a solution of Fe³⁺/Fe²⁺ from when the meter was first turned on. Which of the following was most likely to have caused it?

Select one:

a. Student did not wait for the solution to fully mix

b. Temperature was too high

c. Sample is inert and has no charge

d. Student forgot to remove the cap of the probe

What is the answer for each question?

Answer 1