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Analytical Chem 2 > Oxidation-Reduction > Flashcards

Oxidation-Reduction Flashcards

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1
Q

Chemical reaction involves a change in the balance number of reacting substance.

A

Oxidation-Reduction

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2
Q

GEROA

A

Gain of e-
Reduction
Oxidizing Agents

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3
Q

LEORA

A

Loss of Electrons
Oxidation
Reducing Agent

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4
Q

Methods of Redox Reaction

A

Permanganometry

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4
Q

Methods of ReDox

A

Permanganometry
Cerimetry
Iodimetry-Iodometry

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5
Q

Volumetric Solution in Permanganate method

A

KMnO4

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6
Q

Primary Standard used in Permanganometry

A

Sodium Oxalate

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7
Q

Indicator used in Permanganometry

A

KMnO4 - Self indicating

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8
Q

Endpoint in Permanganometry

A

Pink Color

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9
Q

Direct Titration in Permanganometry

A

H2O2, TiO2

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10
Q

Indirect titration in Permanganometry

A

Malic Acid in Cherry Juice ⭐

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11
Q

Residual Titration in Permanganometry

A

Sodium nitrite
Pb monoxide
NaNO2

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12
Q

Addition of Sulfuric Acid in Permanganate Method

A

Keep the Hydrogen ion concentration throughout the titration
Prevent formation of Manganese dioxide
Supply Hydrogen ion used up in reduction of Permanganate ion.

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13
Q

Most effective chemical substance in removing stains of KMnO4

A

Oxalic Acid

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13
Q

Most effective chemical substance in removing stains of KMnO4

A

Oxalic Acid

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14
Q

Potassium permanganate

A

Mineral chameleon

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15
Q

Number of electrons gained by KMnO4

A

5 e-

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16
Q

Volumetric Solution in Cerimetry ⭐

A

Ceric sulfate (Oxidizing Agent)

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17
Q

Primary Standard in Cerimetry

A

Arsenic trioxide (As2O3)

18
Q

Indicator used in Cerimetry

A

Orthophenanthroline in FeSO4 (Ferrous Phenanthroline)

18
Q

Endpoint in Cerimetry

A

Red to Blue (Ferroin to Ferritin)

19
Q

Analyte used for Direct Titration in Cerimetry

A

Menadiol, Ferrous SO4, Hydroquinone

20
Q

orthophenanthroline in ferrous sulfate solution

A

Form a ferrous complex - Ferroin (Ferrous phenanthroline)

21
Q

Color of complex resulting from reaction with ferrous phenanthroline

A

Red

22
Q

Iodimetry

A

Analyte/Assay: Reducing Agent
Titration: Direct titration
VS: Iodine Soln, Sodium thiosulfate
Primary standard: Arsenic trioxide
Indicator: Starch TS (Added at start)
Endpoint: Blue Color

23
Q

Samples used in Iodimetry

A

Direct: Ascorbic Acid, Arsenious Acid, Potassium tartrate
Residual: Sodium bisulfide , Methionine

24
Q

Iodometry

A

Analyte/Assay: Oxidizing Agent
Titration: Indirect titration
VS: Sodium thiosulfate
Primary standard: Potassium dichromate
Indicator: Starch TS (Added berfore reaching end point)
Endpoint: Disappearance of blue color

25
Q

Samples used in Iodometry

A

Na hypochlorite
Selenium sulfide
Cupric sulfate

26
Q

TF:
Iodine Solution is soluble in water
Does not dissolve readily in presence of KI because of triiodide ion formation
Iodine solutions used in iodimetry are solutions of iodine in potassium iodide soln.

A

False. Iodine is not soluble in water
False. Dissolves readily in presence of KI because of triiodide ion formation (KI - Solubilizing agent)
True

27
Q

Standardization of Arsenic trioxide

A

As2O3 is dissolved in 1N Sodium hydroxide

28
Q

This substance is added to neutralize/buffer the hydroiodic acid, causing the reaction to be completed

A

Sodium bicarbonate

29
Q

Use of boiling of Sodium thiosulfate in standardization of Iodine Solution

A

For sterilization
If carbonic acid, expels CO2 - causing hydrolysis and decomposition

30
Q

Addition of sodium carbonate in Iodine Standardization

A

Preservative
Prevents acid catalyzed hydrolysis

31
Q

Employed whn ASCORBIC ACID is present in a multi vitamin preparation

A

Dichlorophenol-indophenol Titration

32
Q

Volumetric Solution used in Dichlorophenol-indophenol Titration

A

Dichlorophenol-indophenol Solution

33
Q

Primary standard used in Dichlorophenol-indophenol Titration

A

USP Ascorbic Acid Reference Std.

34
Q

Indicator used in Dichlorophenol-indophenol Titration

A

Dichlorophenol-indophenol
Basic: Blue
Acidic: Red

35
Q

Endpoint in Dichlorophenol-indophenol Titration

A

Distinct rose-pink (Persist 5 secs)

36
Q

Samples in Dichlorophenol-indophenol Titration

A

Ascorbic Acid (Tablet, Injection, Hexavit, Decavit)

37
Q

Bromine Method

A

0.1N Bromine as an oxidizing agent in place of iodine

38
Q

Production of water insoluble bromine substitution products such as

A

Tribromoaniline
Tribromophenol

39
Q

Bromine Method assay compounds such as

A

Aniline
Phenol
Resorcinol

40
Q

Bromine Method VS

A

0.1N Bromine Solution (Koppeschaar’s Soln)

41
Q

Bromine Method Primary Std, Indicator, Samples

A

Primary Std: 0.1N Na thiosulfate
Indicator: Starch TS
Samples: Phenol, Thymol

42
Q

Assay for sulfonamide drugs and other compounds containing Arylamines

A

Diazotization with nitrite

43
Q

Diazotization

A

VS: 0.1N Sodium nitrite
Primary Std: Sulfanilamide
Endpoint: Blue ring (Starch iodide paper)
Samples: Benzocaine, Procainamide

Analytical Chem 2 (17 decks)

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