Podcast
Questions and Answers
What does the Nernst equation help to determine in a redox system?
What does the Nernst equation help to determine in a redox system?
- The concentration of the oxidant
- The oxidation potential (correct)
- The temperature dependency of reactants
- The standard reduction potential of the indicator
Which of the following is a key factor that affects the oxidation potential in redox systems?
Which of the following is a key factor that affects the oxidation potential in redox systems?
- Temperature of the reaction (correct)
- Pressure applied to the reactants
- Molecular weight of the oxidant
- Color of the reducing agent
What is an important aspect of redox titration when detecting the endpoint?
What is an important aspect of redox titration when detecting the endpoint?
- The color change of an indicator (correct)
- The temperature of the oxidizing agent
- The pH level of the solution
- The color change of the solvent
In the context of redox titration, how is the color change of the indicator significant?
In the context of redox titration, how is the color change of the indicator significant?
Why is the complexity involved in titrating Fe2+ with Ce4+ often highlighted?
Why is the complexity involved in titrating Fe2+ with Ce4+ often highlighted?
Which of the following best describes a standard oxidant?
Which of the following best describes a standard oxidant?
What is a common disadvantage of using certain internal redox indicators?
What is a common disadvantage of using certain internal redox indicators?
What is the role of phosphate or fluoride when used in conjunction with ferric in a redox reaction?
What is the role of phosphate or fluoride when used in conjunction with ferric in a redox reaction?
Which statement about redox indicators is true?
Which statement about redox indicators is true?
What is a characteristic of potassium permanganate as a titrant?
What is a characteristic of potassium permanganate as a titrant?
Which of the following indicators is used specifically for iodide in redox titrations?
Which of the following indicators is used specifically for iodide in redox titrations?
What is the approximate minimum voltage difference required for a redox indicator?
What is the approximate minimum voltage difference required for a redox indicator?
Which of the following methods is NOT typically used to detect the end point in potentiometric titrations?
Which of the following methods is NOT typically used to detect the end point in potentiometric titrations?
When using Orthophenanthroline, what is the primary reason for its preference over ceric indicators?
When using Orthophenanthroline, what is the primary reason for its preference over ceric indicators?
Which characteristic correctly describes Diphenylamine and SCN in redox titrations?
Which characteristic correctly describes Diphenylamine and SCN in redox titrations?
For the determination of ferrous ions, which indicator is most suitable?
For the determination of ferrous ions, which indicator is most suitable?
What is the effect of a strongly acidic medium on the use of starch in iodine titration?
What is the effect of a strongly acidic medium on the use of starch in iodine titration?
Why is sodium thiosulphate not considered a primary standard substance?
Why is sodium thiosulphate not considered a primary standard substance?
What is the minimum oxidation potential difference required for a complete quantitative redox reaction?
What is the minimum oxidation potential difference required for a complete quantitative redox reaction?
Which indicator is used when titrating ferrous sulfate with permanganate in an acidic medium?
Which indicator is used when titrating ferrous sulfate with permanganate in an acidic medium?
What happens to sodium thiosulphate solution upon standing?
What happens to sodium thiosulphate solution upon standing?
What role does phosphoric acid play in the titration of ferrous sulfate with dichromate?
What role does phosphoric acid play in the titration of ferrous sulfate with dichromate?
Which oxidation state of manganese is produced when ferrous is oxidized in a titration with permanganate?
Which oxidation state of manganese is produced when ferrous is oxidized in a titration with permanganate?
Which compound is a standard reducing agent used for the standardization of permanganate solution?
Which compound is a standard reducing agent used for the standardization of permanganate solution?
Which indicator undergoes a distinct color change at a specific potential?
Which indicator undergoes a distinct color change at a specific potential?
What is the standard solution in iodimetry titrations?
What is the standard solution in iodimetry titrations?
Which substance can increase the solubility of iodine in water?
Which substance can increase the solubility of iodine in water?
In a galvanic cell with zinc and copper electrodes, the zinc electrode functions as which component?
In a galvanic cell with zinc and copper electrodes, the zinc electrode functions as which component?
What happens to the oxidation potential when Zn2+ is added to a ferricyanide/ferrocyanide system?
What happens to the oxidation potential when Zn2+ is added to a ferricyanide/ferrocyanide system?
Flashcards are hidden until you start studying
Study Notes
Redox Titration
- Redox principles
- Involve electron transfer between reactants
- Electrical properties of redox systems
- Measured using a potentiometer
- Nernst equation calculates the potential of an electrode
- Factors affecting oxidation potential
- Concentration of reactants
- pH of the solution
- Temperature
- Detection of the endpoint in redox titration
- Indicators used for end-point detection
- Internal redox indicators change color when oxidized or reduced
- External redox indicators added to the titration solution and change color when oxidized or reduced
- Self-indicators titrants that change color as the reaction proceeds
Standard Oxidants & Reductants
- Standard Oxidants are strong oxidizing agents used in redox titrations
- Potassium permanganate (KMnO4)
- Self indicator
- Pink color in solution
- Ceric sulfate (Ce(SO4)2)
- Indicator: Orthophenanthroline (yellow in reduced form, blue in oxidized form)
- Potassium dichromate (K2Cr2O7)
- Indicator: Diphenylamine (blue in oxidized form)
- Potassium permanganate (KMnO4)
- Standard Reductants are strong reducing agents
- Sodium thiosulfate (Na2S2O3)
- Not a primary standard due to its instability
- Sodium thiosulfate (Na2S2O3)
Applications of Redox Titration
- Determination of Ferrous sulfate (FeSO4)
- Can be titrated with:
- Potassium permanganate (KMnO4)
- Potassium dichromate (K2Cr2O7)
- Ceric sulfate (Ce(SO4)2)
- Can be titrated with:
- Iodimetry titrations:
- Include reducing analytes
- One reaction is used
- Iodine is a standard solution
Potentiometry
- Potentiometric titration:
- Measures the change in potential developed on the indicator electrode during titration
- Different types of titration curves depending on the reaction type (neutralization, complexometric, preciptimetric, and redox)
Conductometry
- Conductometry measures the conductivity of a solution, which changes during titration
- Used to determine the endpoint of a titration.
Water Analysis
- Water analysis uses various techniques to determine the quality and composition of water.
Examples of Redox Titration Indicators
- Orthophenanthroline is a specific indicator in redox titrations
- Starch is a specific indicator for iodide
- Diphenylamine and SCN are examples of internal redox indicators
- Potassium permanganate is a self-indicator titrant
Other Key Facts
- The oxidation potential of the redox indicator must be intermediate between both the oxidant and the reductant, with a difference of at least 0.15 volts.
- The potential developed on a zinc electrode when immersed in zinc sulfate is called the electrode potential.
- Adding Zn2+ to a Ferricyanide/Ferrocyanide system causes the oxidation potential to increase.
- Platinum electrode may acquire a negative charge when the redox system is oxidizing.
Redox Reaction Example
- 3 e- + MnO41- + 4 H+ → Mn2+ + 2 H2O
- The MnO4- ion is reduced to Mn2+ in this reaction.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
