Analytical Chemistry: Electrochemistry Lecture Quiz

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What forms a dark blue complex with triiodide ions, indicating the endpoint in certain titrations?

Aluminum

Starch (correct)

Iron(III)

Silver

In an oxidation/reduction titration, why must the analyte initially be in a single oxidation state?

To make the titration process faster

To prevent interference from excess reagent

To enhance the color change of the indicator

To ensure accurate titration results (correct)

What is necessary for an auxiliary reducing agent to be useful as a prooxidant or a pre reductant in titrations?

Interference with the standard solution

Formation of a gas

Color change of the solution

Quantitative reaction with the analyte (correct)

What is a measure of the tendency of an electrochemical cell reaction to proceed toward equilibrium?

Cell potential Signup and view all the answers

Which electrode is where a reduction reaction occurs in an electrochemical cell?

Cathode Signup and view all the answers

What has been used as a universal reference electrode in electrochemistry?

Standard hydrogen electrode (SHE) Signup and view all the answers

What is the purpose of using sodium bismuthate in the context provided?

To act as an oxidizing agent Signup and view all the answers

Which of the following metals is NOT included in the list provided as good reducing agents?

Iron Signup and view all the answers

What is the main function of a pH electrode in the clinical laboratory according to the passage?

To assess pH levels Signup and view all the answers

In the context of potentimetry, what is the primary role of the liquid junction?

To prevent contamination between samples Signup and view all the answers

Which solution is commonly used as a filling solution due to the similar mobility of its ions?

$KCl$ solution Signup and view all the answers

What is the purpose of the null-balance technique in the context of potentimetry?

To ensure accurate voltage readings Signup and view all the answers

What is the Ilkovic equation used to show?

The relationship between analyte diffusion coefficient and analyte concentration Signup and view all the answers

What does Faraday's Law relate the number of coulombs consumed to?

The amount of electricity at a fixed potential Signup and view all the answers

In amperometry, what is the equivalence point established by?

Changes in average of current passing through a solution Signup and view all the answers

What does coulometry measure in terms of current flow?

Current flow between non-polarizable electrodes Signup and view all the answers

How is electrical connection achieved between the indicator and reference electrodes in polarography?

By allowing a slow flow LMVP III Signup and view all the answers

What does amperometry measure?

Current flow when a constant voltage is applied Signup and view all the answers

What is the primary focus of electrochemical analyses in the clinical laboratory?

Measuring the current or voltage generated by specific ions Signup and view all the answers

Which type of cell is spontaneously produced when the external E is turned off in an electrolytic cell?

Galvanic cell Signup and view all the answers

What is the primary role of a reducing agent in a redox reaction?

Donating electrons Signup and view all the answers

Which of the following is NOT a common type of electrochemical analysis used in the clinical laboratory?

Spectrometry Signup and view all the answers

What is the primary function of a salt bridge in an electrochemical cell?

To allow ions to flow between the two half-cells Signup and view all the answers

Which of the following is NOT a characteristic of an oxidation-reduction titration?

Involves a change in the chemical structure of reactants Signup and view all the answers

What type of cell operates spontaneously and requires no external source of electrical energy?

Galvanic cell Signup and view all the answers

What happens to a galvanic cell when one of the chemical components is depleted?

The cell becomes a dead cell and cannot produce electrical energy Signup and view all the answers

What is the effect of the completeness of a reaction on the titration curves for oxidation/reduction reactions?

The change in the equivalence-point region becomes larger Signup and view all the answers

What substances can function as true redox indicators?

Substances that change color upon being oxidized or reduced Signup and view all the answers

What type of cell requires an external source of electrical energy for operation?

Electrolytic cell Signup and view all the answers

What is formed at the cathode when electrons pass through the external meter in a galvanic cell?

OH− ions Signup and view all the answers