Electrochemistry

Question 1

the magnitude of a voltage or current signal originating from an electrochemical cell is related to the activity or concentration of a particular chemical species in the cell

Answer 1

Electrochemistry

Question 2

involves the measurement of electrical signals associated with chemical system that are incorporated into an electrochemical cell

Answer 2

Electrochemistry

Question 3

converts chemical energy into electrical energy.

Answer 3

Galvanic cell

Question 4

are required to complete the circuit between the reference and without contaminating anything.

Answer 4

Liquid junction - also known as a salt bridge

Question 5

Functions:
It allows electrical contact between the two solutions.

It prevents the mixing of the electrode solutions.

It maintains the electrical neutrality in each half cell as ions flow into and out of the salt bridge.

Answer 5

Liquid junction - also known as a salt bridge

Question 6

Electrochemical Techniques

Answer 6

Potentiometry
Coulometry
Amperometry
Voltammetry

Question 7

measurement of a potential or voltage difference between two electrodes immersed in solution under the condition of essentially zero current.

Answer 7

Potentiometry

Question 8

the measured potential is related to the molar concentration by the____ equation

Answer 8

Potentiometry

Nernst

Question 9

Potentiometry

ELECTRODES

• responds to changes in the activity of solution measuring electrode

Answer 9

b)Indicator Electrode

Question 10

Reference Electrode

_____mercury/mercurous chloride

_____overall better and faster

_____

Answer 10

Calomel electrode

Silver/silver chloride

Normal hydrogen electrode

Question 11

-indicator electrode that can respond to individual types of anions or cations

-very sensitive and selective for the ion it measures

Answer 11

Ion-selective electrode

Question 12

2 types of Ion-selective electrode

Answer 12

(1) Direct ISE
(2) Indirect ISE

Question 13

-its ionic selectivity depends on the membrane/barrier composition used

Answer 13

Ion-selective electrode

Question 14

Ion selective electrodes

a. glass aluminum silicate (____)
b. valinomycin gel (____)
c. organic liquid membrane ion exchangers (_____)
d. gas and enzyme electrodes

Answer 14

Sodium

Potassium

Calcium and Lithium

Question 15

selective for the detection of hydrogen

ions indicator electrode has a glass membrane

Answer 15

pH electrode

Question 16

pH electrode

internal reference electrode

Answer 16

Ag/AgCl

Question 17

pH electrode contained within a plastic jacket.

sodium buffer and permeable membrane (_____)

Answer 17

pCO2 electrode

Teflon silicone

Question 18

The measurement of current after which a potential is applied to an electrochemical cell

Answer 18

Voltammetry

Question 19

• for Lead and Iron Testing

Answer 19

Anodic stripping voltammetry

Question 20

Three Electrodes for voltammetry

Answer 20

Working Electrode
Reference Electrode
Auxiliary Electrode

Question 21

makes contact with the analyte facilitate the transfer of charge to and from the analyte

Answer 21

a)WORKING ELECTRODE

Question 22

a half cell with a known reduction potential

Answer 22

b)REFERENCE ELECTRODE

Question 23

to sustain electrolysis - process by which electric current is passed through a substance to effect a chemical change (substance loses or gains an electron)

Answer 23

c)AUXILIARY ELECTRODE

Question 24

Coulometry

is an electrochemical titration in which the titrant is electrochemically generated and the endpoint is detected by______

Answer 24

amperometry

Question 25

the time required to titrate a sample at a constant current is measured and is related to the amount of analyte in a sample by______

Answer 25

Coulometry Faraday’s equation

Question 26

Coulometry Use:

Answer 26

Chloride test (CSF, serum and sweat)

Question 27

is the measurement of the current flow produced by an oxidation–reduction reaction at a single applied potential

Answer 27

Amperometry

Question 28

a measure of the cell current when the potential difference between indicator and reference electrodes is controlled

Answer 28

Amperometry

Question 29

- uses a gas-permeable membrane, usually polypropylene, which allows dissolved oxygen to pass through

Answer 29

pO 2 gas-sensing electrode

Question 30

Glucose electrode

Answer 30

Amperometry

Question 31

measure potential (voltage) under zero current

Answer 31

Potentiometry

Question 32

is an electrochemical titration in which the titrant is electrochemically generated and the endpoint is detected by amperometry; constant current

Answer 32

Coulometry

Question 33

measure current after applying a potential

Answer 33

Voltammetry

Question 34

measure current, controlled/constant potential (voltage)

Answer 34

Amperometry

Question 35

Where oxidation takes place

Answer 35

Anode

Question 36

Where reduction takes place

Answer 36

Cathode

Question 37

_____reaction is spontaneous and is responsible for the production of electrical energy.

Answer 37

redox

Question 38

The two______ are set up in different containers, being connected through the salt bridge or porous partition.

Answer 38

half-cells

Question 39

Potentiometry ELECTRODES - Produces constant potential

Answer 39

a.) reference electrode

Question 40

ISE (Sodium)

Answer 40

glass aluminum silicate

Question 41

ISE (Potassium)

Answer 41

valinomycin gel

Question 42

ISE (Calcium and Lithium)

Answer 42

organic liquid membrane ion exchangers

Question 43

Produces constant potential

Answer 43

Reference electrodes