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CC LEC > Electrochemistry > Flashcards

Electrochemistry Flashcards

1
Q

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

A

Electrochemistry

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2
Q

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

A

Electrochemistry

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3
Q

converts chemical energy into electrical energy.

A

Galvanic cell

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4
Q

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

A

Liquid junction - also known as a salt bridge

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5
Q

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.

A

Liquid junction - also known as a salt bridge

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6
Q

Electrochemical Techniques

A

Potentiometry
Coulometry
Amperometry
Voltammetry

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7
Q

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

A

Potentiometry

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8
Q

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

A

Potentiometry

Nernst

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9
Q

Potentiometry

ELECTRODES

  • responds to changes in the activity of solution measuring electrode
A

b)Indicator Electrode

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10
Q

Reference Electrode

_____mercury/mercurous chloride

_____overall better and faster

_____

A

Calomel electrode

Silver/silver chloride

Normal hydrogen electrode

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11
Q

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

-very sensitive and selective for the ion it measures

A

Ion-selective electrode

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12
Q

2 types of Ion-selective electrode

A

(1) Direct ISE
(2) Indirect ISE

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13
Q

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

A

Ion-selective electrode

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14
Q

Ion selective electrodes

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

A

Sodium

Potassium

Calcium and Lithium

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15
Q

selective for the detection of hydrogen

ions indicator electrode has a glass membrane

A

pH electrode

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16
Q

pH electrode

internal reference electrode

A

Ag/AgCl

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17
Q

pH electrode contained within a plastic jacket.

sodium buffer and permeable membrane (_____)

A

pCO2 electrode

Teflon silicone

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18
Q

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

A

Voltammetry

19
Q
  • for Lead and Iron Testing
A

Anodic stripping voltammetry

20
Q

Three Electrodes for voltammetry

A

Working Electrode
Reference Electrode
Auxiliary Electrode

21
Q

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

A

a)WORKING ELECTRODE

22
Q

a half cell with a known reduction potential

A

b)REFERENCE ELECTRODE

23
Q

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

A

c)AUXILIARY ELECTRODE

24
Q

Coulometry

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

A

amperometry

25
Q

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______

A

Coulometry

Faraday’s equation

26
Q

Coulometry

Use:

A

Chloride test (CSF, serum and sweat)

27
Q

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

A

Amperometry

28
Q

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

A

Amperometry

29
Q
  • uses a gas-permeable membrane, usually polypropylene, which allows dissolved oxygen to pass through
A

pO 2 gas-sensing electrode

30
Q

Glucose electrode

A

Amperometry

31
Q

measure potential (voltage) under zero current

A

Potentiometry

32
Q

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

A

Coulometry

33
Q

measure current after applying a potential

A

Voltammetry

34
Q

measure current, controlled/constant potential (voltage)

A

Amperometry

35
Q

Where oxidation takes place

A

Anode

36
Q

Where reduction takes place

A

Cathode

37
Q

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

A

redox

38
Q

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

A

half-cells

39
Q

Potentiometry

ELECTRODES

  • Produces constant potential
A

a.) reference electrode

40
Q

ISE

(Sodium)

A

glass aluminum silicate

41
Q

ISE

(Potassium)

A

valinomycin gel

42
Q

ISE

(Calcium and Lithium)

A

organic liquid membrane ion exchangers

43
Q

Produces constant potential

A

Reference electrodes

CC LEC (39 decks)

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