Reduction-Oxidation Titration Method

Flashcards covering key terms and concepts from the lecture on Reduction-Oxidation Titration Method.

Reduction reaction

A reaction that occurs when a substance gains an electron.

Oxidation reaction

A reaction that occurs when a substance loses an electron.

Permanganometry

A titration method that uses potassium permanganate as the titrant.

Cerimetry

A titration method that involves ceric sulfate.

Iodimetry

A titration method that uses iodine.

Iodometry

A titration method that involves measuring the amount of iodine present.

Oxidizing agent

A substance that gains electrons during a redox reaction.

Reducing agent

A substance that loses electrons during a redox reaction.

Mnemonics LEORA

A mnemonic to remember that Loss of Electron is Oxidation by Reducing Agent.

Mnemonics GEROA

A mnemonic to remember that Gain of Electron is Reduction by Oxidizing Agent.

Potassium permanganate

Potassium dichromate

Ceric sulfate

Oxidizing agent ex.

Oxalic acid 

Sodium oxalate 

Sodium thiosulfate 

Ferrous sulfate

Reducing agent ex.

Potassium Permanganate (KMnO4)

oxidizing agent with intense purple in color.

Potassium Permanganate (KMnO4)

an oxidizing agent that can highly stain the skin, nails and clothing a brown color.

using strong reducing agent like Ascorbic acid

how to remove a stain of Potassium Permanganate?

• Iron

• Oxalate ions

• Hydrogen peroxide

• Nitrite ions

• Sulfite ions

• Arsenite ions

• Manganese ions

Permanganometry are being used for?

Potassium permanganate

Titrant used in Permanganometry?

None

Indicator used for Permanganometry

 Sulfuric acid

Analyte used for the Direct Titration in Permanganometry?

• Malic acid in Cherry juice

• Titanium dioxide

• Sodium nitrate

• Potassium nitrate

• Lead oxide

Analyte used for the Indirect Titration in Permanganometry?

Pale Pink (15-30 seconds)

what is the end point in Permanganometry?

• To prevent hydrolysis

• To prevent precipitation of salts

Providing sufficient sulfuric acid in Ceric Sulfate Solution is present in order to?

1. Ferrous sulfate (Anti anemic)

2. Menadione Sodium (Anti hemorrhagic)

3. Vitamin K (aka phytomenadione)

Pharmaceutical preparation that undergoes Cerimetry

Na oxalate

Old Titrant: Arsenic trioxide

Titrant used in Cerimetry?

O-phenanthroline

Indicator used in Cerimetry?

Ferrous sulfate

Menadione sodium

Vitamin K

Analyte used for Cerimetry?

Red to Blue

End point in Cerimetry?

IODIMETRY

A direct redox titration method that utilizes a standardized solution of iodine

1. Vitamin C (Ascorbic acid)

2. Sodium thiosulfate

3. Arsenic compounds

4. Antimony compounds

5. Sulfides and Sulfites

Examples of reducing agents

Direct Titration

what type of titration is performed in Iodimetry?

Reducing agents:

1. Thiosulfates

2. Arsenites

3. Vit. C

Analyte used in Iodimetry?

Startch

Indicator used in Iodimetry?

Blue-black color

Endpoint in Iodimetry?

IODOMETRY

An indirect redox titration method used to determine the concentration of an oxidizing analyte.

Determination of:

• Copper

• Chlorine in water

• dissolved oxygen

• Hydrogen peroxide

• Potassium permanganate

Iodometry is preformed for?

Indirect Titration

what type of titration performed Iodometry?

Sodium thiosulfate

Titrant used in Iodometry

Oxidizing agents:

1. Ferric salts

2. Cupric salts

3. Available chlorine

Analyte used in Iodometry?

Starch

Indicator in Iodometry?

Disappearance of blue color

Endpoint in Iodometry?