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Analytical Chemistry > Redox Titrimetric Methods > Flashcards

Redox Titrimetric Methods Flashcards

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1
Q

Give the three most commonly oxiding titrants in redox methods.

A

Permanganate, dichromate, iodine

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2
Q

Give the two common reducing titrants in redox methods

A

Fe2+ and thiosulfate

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3
Q

The reaction of permanganate is in ___ medium.

A

Acidic

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4
Q

The reaction of permanganate is in ___ medium.

A

Acidic

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5
Q

In permanganimetry, the titration does not require an indicator since the oxidized (violet) and reduced (colorless) forms of titrant (MnO4-) differ in color. True or false

A

True

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6
Q

KMnO4 can be standardized in acidic medium using which of the ff.
A. Pure Fe wire
B. Sodium oxalate
C. Arsenic trioxide

A

ABC

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7
Q

At the beginning of the titration, the violet color of MnO4- persists for several seconds before it disappears. As Mn2+ is formed, the reaction proceeds more rapidly as a result of ______.

A

Autocatalysis

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8
Q

What is the endpoint of permanganimetry when an excess MnO4- has been added.

A

Faint pink color

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9
Q

n of C2O4^2-

A

2

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10
Q

n of MnO4-

A

5

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11
Q

Common oxidizing titrant weaker than permanganate, dichromate, and cerium

A

Iodine

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12
Q

Solutions of iodine lack ____ so they are standardized regularly

A

Stability

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13
Q

2 types of titrations that involves iodine. Which of the two is commonly performed?

A

Iodometry and Iodimetry.
Iodometry

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14
Q

________ refers to the direct use of iodine while ________ refers to the generation of iodine.

A

Iodometry, Iodometry

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15
Q

Process that involves the titration of an analyte (reducing agent) with solutions of iodine (oxidizing agent)

A

Iodimetry

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16
Q

Process of indirect determination of an analyte (oxidizing agent) shich is added to excess iodide to produce iodine, titrated with standard thisoulfate solution.

A

Iodometry

17
Q

Forms when the molecular iodine complexes with iodine. It also forms a dark blue complex with the amylose units of starch

A

Triiodide ion (I-)

18
Q

Triiodide io decomposes in solutions when the concentration of iodine is high.Thus ____ is added before nearing the endpoint, and addition of _____ is resumed until the end point is reached.

A

Starch, titrant (thiosulfate)

19
Q

Solutions of ____ can be used in place of KMnO4- in most procedures as it’s also a strong oxidizing agent.

A

Ce4+

20
Q

Solutions of Ce4+ can be prepared from the primary standard _____ in 1M H2S2O4

A

Diammonium hexanitratoacerate (IV)
(NH4)2[Ce(NO3)6]

21
Q

In oxidation with cerium, Ce4+ prepared from other salts such as Ce(OH)4 must be standardized using ____

A

Iron or sodium oxalate

22
Q

Ce4+ is _____ (in acid) and Ce3+ is ____. Yet cerium can’t serve as it’s own indicator because the color is not so distinct.

A

yellow, colorless

23
Q

These are used to visually detect end points during redox titrations.

A

Redox indicators

24
Q

What is the suitable indicator for Ce4+ when the primary standard used is Fe2+

A

Tris (1,10- phenanthroline) iron or ferroin

25
Q

A relatively strong oxidizing agent, though weaker compared to permanganate and cerium

A

Potassium dichromate

26
Q

Use of K2Cr2O7 as ______ is limited only to analytes that are highly oxidizable.

A

Oxidant

27
Q

Which of the ff. are the advantages of using dichromate?
A. availability as primary standard
B. Long term stability of it’s solution

A

AB

28
Q

The color of Cr2O7^2- is ______ and complexes of Cr3+ range from ______ to ______.

A

Orange, green to violet

29
Q

True lr false. Dichromate can serve as it’s own indicator.

A

False

30
Q

_______ whose oxidized form is ______ and reduced form is _____, giver very distict end point with Cr2O7^2-.

A

Diphenylamine sulfonic acid (C12H11NO3S)
Red-violet
Colorless

31
Q

____ proposed ____ that relates the reduction potential (E) of an electrochemical reaction to the standard electrode potential (E°), temperature and activities (or concentrations) of the chemical species undergoing reduction and oxidation

A

Walther Nernst, Nernst Equation

32
Q

By plotting the reduction potential of an electrochemical cell against the volume of titrant, ____ can be generated.

A

Titration curve

Analytical Chemistry (16 decks)

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